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The workaround is to power cycle the switch for a quick recovery. This is a software issue and the switch does not require replacement. When a switchover occurs in a switch stack, the host session information is lost. The workaround is to reauthenticate all the clients. When the show epm session summary or show epm command is entered from an SSH or telnet session and another command is entered from the console, the switch might unexpectedly reset and generate crash information.

The switch might occasionally reload after experiencing a CPU overload, regardless of what process is overloading the CPU. The switch downloads the running IOS image from the TFTP server and reboots even though the same image is currently loaded and running. An attacker could exploit this vulnerability by sending a crafted request to an affected device that has the DHCP version 6 DHCPv6 server feature enabled, causing a reload. This advisory is available at the following link:.

When an interface is configured with the mls qos command, traffic is not matched by port-based QoS ACLs that use the range option. The workaround is to is to configure the switch using the single port eq keyword.

Alternatively, you can configure the trust under class-default setting for the same policy-map that uses the acl-range option. In a switch stack, you cannot establish a console session with a member switch when an ACL is applied to the VTY lines.

The workaround is to use the following procedure when you apply an ACL to line vty 0 4 and line vty 5 Create the vty ACL and permit the network. Append the vrf-also keyword to the configured access-class inbound. In a switch stack, the show interface command shows incorrect values for output drops. The workaround is to use the show platform port-asic stats drops command to see the correct values. A static route that has the next hop set to null0 is removed when the master switch is changed in a switch stack configuration.

This situation occurs when the switch is stacked and the static route is advertised by the network 0. The workaround is to use the ip summary-address eigrp as-number ip-address mask command to set the IP summary aggregate address for the interface through which the next hop can be found.

The Catalyst E series switch with Supervisor Engine 7L-E contains a denial of service DoS vulnerability when processing specially crafted packets that can cause a reload of the device. When ports from each switch in a switch stack are bundled together to form an uplink port channel, Multicast VLAN Registration MVR streams are sent only to the switch with the active member in the port channel.

When a device is moved from one port to another in a switch stack, the SNMP data generated for the move event is incorrect. Users connecting to the network through a device configured for web proxy authentication may experience a web authentication failure. Using the dot1x default command on a port disables access control on the port and resets the values of the authentication host-mode and authentication timer reauthenticate commands to the default values.

The workaround is to avoid using the dot1x default command and set various dot1x parameters individually. You can also reconfigure the parameters that were changed after you entered the dot1x default command. The workaround is to flap the ingress physical interface, the SVI, or the port channel.

In a switch stack setup after you reload a member switch, a multilayer switching MLS class of service CoS configuration command with a specified value such as mls qos cos 7 on the slave switch does not function anymore. This situation impacts untagged IP and Layer 2 packets. The workaround is to ensure that when you configure a service policy on an interface, an interface default level CoS is also configured.

You can use mls trust qos cos command in interface configuration mode. Frame check sequence FCS errors occur when the switch receives jumbo frames greater than bytes on downlink ports. When using the switchport port-security maximum 1 vlan access command, if an IP-phone with a personal computer connected to it is connected to an access port with port security, a security violation will occur on the interface.

This type of message is displayed on the console:. The workaround is to remove the line switchport port-security maximum 1 vlan access. The switch does not correctly detect a loopback when the switch port on an authenticated IP phone is looped to a port configured and authenticated with dot1x security, even when bpduguard is configured on the interface.

This situation can result in percent CPU utilization and degraded switch performance. The workaround is to configure the interface with the authentication open command or to configure authentication mac-move permit on the switch. The workaround is to save the configuration and reload the switch.

Alternatively, configure the switch by entering the no macro auto monitor command followed by the macro auto monitor command after the port is bundled for the first time.

The workaround for v2 stacks is to limit the setup to 5 switches. If more then 5 switches are required in a stack, keep the number of VLANs and enabled features as low as possible. On the downlink interfaces, the switches are capable of sourcing IEEE These documents provide complete information about the Catalyst , , , S and switches and the Cisco EtherSwitch service modules and are available at Cisco.

These documents provide complete information about the Catalyst switches and the Cisco EtherSwitch service modules:. These documents provide complete information about the Catalyst switches:. These documents provide complete information about the Catalyst and S switches and are available on Cisco. For other information about related products, see these documents:. SFP compatibility matrix documents are available from this Cisco.

Table 2 Catalyst Switches Supported Switch. Support Cisco FlexStack technology. Table 4 Other Supported Hardware Switch. We recommend 1 GHz. Internet Explorer 6. Cluster Compatibility You cannot create and manage switch clusters through the device manager. When creating a switch cluster or adding a switch to a cluster, follow these guidelines: When you create a switch cluster, we recommend configuring the highest-end switch in your cluster as the command switch. If you are managing the cluster through Network Assistant, the switch with the latest software should be the command switch.

The standby command switch must be the same type as the command switch. For example, if the command switch is a Catalyst switch, all standby command switches must be Catalyst switches. Deciding Which Files to Use The upgrade procedures in these release notes describe how to perform the upgrade by using a combined tar file.

To download software, follow these steps: Step 1 Use Table 6 to identify the file that you want to download. Step 2 Download the software image file: a.

Navigate to your switch model. The bootloader can take up to 1 minute to upgrade the first time that the new software is loaded. Do not power cycle the switch during the bootloader upgrade. Switch ping tftp-server-address. Installation Notes Use these methods to assign IP information to your switch: The Express Setup program , as described in the switch getting started guide.

The CLI-based setup program, as described in the switch hardware installation guide. The DHCP-based autoconfiguration, as described in the switch software configuration guide. Manually assigning an IP address, as described in the switch software configuration guide. Option to configure a default class on Catalyst S switches by using the class class-default policy-map configuration command. For more information, see the Configuring QoS chapter of the software configuration guide on Cisco.

The all keyword is now removed from the timers throttle lsa global configuration command. The vstack startup-vlan command has been added. For more information, see the command reference on Cisco.

The switch supports For more information, see the Configuring MACsec Encryption chapter in the software configuration guide. LAN Base image for Catalyst C and S switches; IP Base image for Catalyst C switch Support for configuring static IPv6 routes in the routing table so that packet data can be sent to networks that are not directly connected to the router. For more information, see the Configuring Port-Based Traffic Control chapter in the software configuration guide.

Limitations and Restrictions You should review this section before you begin working with the switch. This problem occurs under these conditions: — When the switch is booted up without a configuration no config.

CSCec Catalyst or switches and Cisco EtherSwitch service modules When you change a port from a nonrouted port to a routed port or the reverse, the applied auto-QoS setting is not changed or updated when you verify it by using the show running interface or show mls qos interface user EXEC commands.

These are the workarounds: 1. Disable auto-QoS on the interface. The problem is observed only when the switch is receiving frames. Any log entries that are still in the log buffer have not been output as a system message on a switch that fails are lost. CSCed When port security is enabled on an interface in restricted mode and the switchport block unicast interface command has been entered on that interface, MAC addresses are incorrectly forwarded when they should be blocked The workaround is to enter the no switchport block unicast interface configuration command on that specific interface.

The switch rejects a CLI command to change the baud rate. This does not affect switch functionality. CSCsj When you enter the boot host retry timeout global configuration command to specify the amount of time that the client should keep trying to download the configuration and you do not enter a timeout value, the default value is zero, which should mean that the client keeps trying indefinitely.

However, the client does not keep trying to download the configuration. CSCsk When the configuration file is removed from the switch and the switch is rebooted, port status for VLAN 1 and the management port Fast Ethernet 0 is sometimes reported as up and sometimes as down , resulting in conflicts.

This status depends on when you respond to the reboot query: Would you like to enter the initial configuration dialog? CSCsl Catalyst and switches A T-start error message appears after startup under these conditions: — Two-link ports on the same switch are connected with a crossover cable.

CSCsz When authorization and accounting are enabled on the switch and you use the interface range command to change the configuration on a range of interfaces, the change might cause high CPU utilization and authentication failures.

The device-sensor accounting global configuration command is not available on Catalyst series switches. Cisco EtherSwitch service modules When a Cisco EtherSwitch service module reloads or the internal link resets, there can be up to a second delay in providing power to PoE devices, depending on the configuration. If the internal Gigabit Ethernet interface on a Cisco EtherSwitch service module connected to the router is configured as a switch port in access mode or in trunk mode, the internal link is not operational until it reaches the STP forwarding state.

Therefore, the PoE that comes from the host router is also not available until the internal Gigabit Ethernet link reaches the STP forwarding state.

This is due to STP convergence time. This problem does not occur on routed ports. Traffic on EtherChannel ports is not perfectly load-balanced. Egress traffic on EtherChannel ports are distributed to member ports on load balance configuration and traffic characteristics like MAC or IP address. More than one traffic stream may map to same member ports based on hashing results calculated by the ASIC. Use any of these workarounds to improve EtherChannel load balancing: — for random source-ip and dest-ip traffic, configure load balance method as src-dst-ip — for incrementing source-ip traffic, configure load balance method as src-ip — for incrementing dest-ip traffic, configure load balance method as dst-ip — Configure the number of ports in the EtherChannel so that the number is equal to a power of 2 i.

CSCdw Catalyst or switches and Cisco EtherSwitch service modules Known unicast secured addresses are flooded within a bridge group if secure addresses are learned or configured on a port and the VLAN on this port is part of a bridge group. Non-IP traffic destined to the secure addresses is flooded within the bridge group. CSCea When the rate of received DHCP requests exceeds 2, packets per minute for a long time, the response time might be slow when you are using the console.

Because learning is restricted on IEEE No workaround is necessary. The switch grants power only when the maximum wattage configured on the port is less than or equal to the IEEE class maximum.

This ensures that the switch power budget is not oversubscribed. There is no such mechanism in Cisco prestandard powered devices. CSCee Phone detection events that are generated by many IEEE phones connected to the switch ports can consume a significant amount of CPU time if the switch ports cannot power the phones because the internal link is down. These access points should be discovered as Cisco pre-standard devices. Multicasting Catalyst or switches and Cisco EtherSwitch service modules The switch does not support tunnel interfaces for unicast routed traffic.

Because unnecessary traffic is sent on the trunk port, it reduces the bandwidth of the port. CSCdu If the number of multicast routes and Internet Group Management Protocol IGMP groups are more than the maximum number specified by the show sdm prefer global configuration command, the traffic received on unknown groups is flooded in the received VLAN even though the show ip igmp snooping multicast-table privileged EXEC command output shows otherwise.

It is not applied to packets that are forwarded through software. Hence, with multicast routing enabled, the first few packets are sent from a port even when IGMP filtering is set to deny those groups on that port.

This provides reachability to directly connected clients, if any, in the VLAN. CSCdz Catalyst switch stack If the stack master is power cycled immediately after you enter the ip mroute global configuration command, there is a slight chance that this configuration change might be lost after the stack master changes.

This occurs because the stack master did not have time to propagate the running configuration to all the stack members before it was powered down. This problem might also affect other configuration commands. IP PIM is not supported on tunnel interfaces. CSCee Incomplete multicast traffic can be seen under either of these conditions: — You disable IP multicast routing or re-enable it globally on an interface.

CSCef After you configure a switch to join a multicast group by entering the ip igmp join-group group-address interface configuration command, the switch does not receive join packets from the client, and the switch port connected to the client is removed from the IGMP snooping forwarding table.

Use one of these workarounds: — Cancel membership in the multicast group by using the no ip igmp join-group group-address interface configuration command on an SVI. The remaining power shown is available for allocation to switching ports on all Cisco EtherSwitch service modules in the router. This output appears: Router show power inline. PowerSupply SlotNum. Maximum Allocated Status. INT-PS 0 QoS Some switch queues are disabled if the buffer size or threshold level is set too low with the mls qos queue-set output global configuration command.

The ratio of buffer size to threshold level should be greater than 10 to avoid disabling the queue. Instead, the switch uses shaped round robin SRR as the queuing mechanism. The auto-QoS feature is designed on each platform based on the feature set and hardware limitations, and the queuing mechanism supported on each platform might be different.

Routing Catalyst or switches and Cisco EtherSwitch service modules The switch does not support tunnel interfaces for unicast routed traffic. The switch rejects this configuration and displays a message that the route map is unsupported.

Smart Install When upgrading switches in a stack, the director cannot send the correct image and configuration to the stack if all switches in the stack do not start at the same time. A switch in the stack could then receive an incorrect image or configuration. CSCte Backing up a Smart Install configuration could fail if the backup repository is a Windows server and the backup file already exists in the server. CSCte In a Smart Install network, when the director is connected between the client and the DHCP server and the server has options configured for image and configuration, then the client does not receive the image and configuration files sent by the DHCP server during an automatic upgrade.

Instead the files are overwritten by the director and the client receives the image and configuration that the director sends. Use one of these workarounds: — If client needs to upgrade using an image and configuration file configured in the DHCP server options, you should remove the client from the Smart Install network during the upgrade.

CSCte In a Smart Install network with the backup feature enabled the default , the director sends the backup configuration file to the client during zero-touch replacement. However, when the client is a switch in a stack, the client receives the seed file from the director instead of receiving the backup configuration file. CSCtf If the director in the Smart Install network is located between an access point and the DHCP server, the access point tries to use the Smart Install feature to upgrade even though access points are not supported devices.

The upgrade fails because the director does not have an image and configuration file for the access point. If the client switch does not have a configured password, there are unexpected results depending on the software release running on the client: — When you select the NONE option in the director CLI, the upgrade should be allowed and is successful on client switches running Cisco IOS Release This limitation does not apply to bridged packets.

The workaround for local SPAN is to use the replicate option. For a remote SPAN session, there is no workaround. This problem does not appear with local SPAN when the encapsulation replicate option is used. The workaround is to use the encapsulate replicate keywords in the monitor session global configuration command. Otherwise, there is no workaround. The amount of degradation depends on the processor loading. Typically, the switch can egress SPAN at up to 40, packets per second byte packets.

As long as the total traffic being monitored is below this limit, there is no degradation. However, if the traffic being monitored exceeds the limit, only a portion of the source stream is spanned. In all cases, normal traffic is not affected; the degradation limits only how much of the original source stream can be egress spanned. If fallback bridging and multicast routing are disabled, egress SPAN is not degraded. Ingress-spanning of such packets is not accurate and can vary with the traffic rate.

Typically, very few or none of these packets are spanned. Stacking Catalyst or Cisco EtherSwitch service module switch stack only If the stack master is immediately reloaded after adding multiple VLANs, the new stack master might fail. The workaround is to wait a few minutes after adding VLANs before reloading the stack master. CSCea If the console speed is changed on a stack, the configuration file is updated, but the baud rate is not. When the switch is reloaded, meaningless characters might appear on the console during bootup before the configuration file is parsed and the console speed is set to the correct value.

If manual bootup is enabled or the startup configuration is deleted after you change the console speed, you cannot access the console after the switch reboots. CSCed If a stack member is removed from a stack and either the configuration is not saved or another switch is added to the stack at the same time, the configuration of the first member switch might be lost. CSCed When the switchport and no switchport interface configuration commands are entered more than 20, times on a port of a Catalyst switch or on a Cisco EtherSwitch service module, all available memory is used, and the switch halts.

This only impacts traffic that will be routed through the switch that is being reloaded. Only one of these is necessary: — Reload the stack after an IP services image to IP base image master switch change or the reverse. CSCee Port configuration information is lost when changing from switchport to no switchport modes on Catalyst switches.

CSCee When connected to the router through an auxiliary port in a session to a Cisco EtherSwitch service module, the service module session fails when you enter the shutdown and the no shutdown interface configuration commands on the service module router interface. These are the workarounds: — Reload the router.

CSCeh Cisco EtherSwitch service modules If one switch in a stack of Catalyst switches requires more time than the other switches to find a bootable image, it might miss the stack master election window. However, even if the switch does not participate in the stack master election, it will join the stack as a member. CSCei When the path cost to the root bridge is equal from a port on a stacked root and a port on a non stack root, the BLK port is not chosen correctly in the stack when the designated bridge priority changes.

CSCsd When a stack of switches is configured with a Cross-Stack EtherChannel and one of the physical ports in the EtherChannel has a link-up or a link-down event, the stack might transmit duplicate packets across the EtherChannel. The problem occurs during the very brief interval while the switch stack is adjusting the EtherChannel for changing conditions and adapting the load balance algorithm to the new set of active physical ports.

CSCse If a new member switch joins a switch stack within 30 seconds of a command to copy the switch configuration to the running configuration of the stack master being entered, the new member might not get the latest running configuration and might not operate properly.

You can use one of these workarounds: — Enter the shutdown and the no shutdown interface configuration commands to reset the port. CSCsi In a mixed stack of Catalyst switches and Catalyst E switches, when the stack reloads, the Catalyst E might not become stack master, even it has a higher switch priority set. CSCsi A stack member switch might fail to bundle Layer 2 protocol tunnel ports into a port channel when you have followed these steps: 1. Switch config-if l2protocol-tunnel cdp.

Switch config-if channel-group 1 mode on CSCsk Catalyst switches. If a Catalyst switch stack is connected to a designated bridge and the root port of the switch stack is on a different switch than the alternate root port, changing the port priority of the designated ports on the designated bridge has no effect on the root port selection for the Catalyst switch stack. Valid IEEE Enable port security on one or more of the ports affected by the private VLAN configuration.

CSCse, Catalyst switches only When line rate traffic is passing through a dynamic port, and you enter the switchport access vlan dynamic interface configuration command for a range of ports, the VLANs might not be assigned correctly.

Device Manager Limitations When you are prompted to accept the security certificate and you click No , you only see a blank screen, and the device manager does not launch. Catalyst switches do not support switch stacking. However, the show processes privileged EXEC command still lists stack-related processes. This occurs because these switches share common code with other switches that do support stacking. Catalyst switches and Cisco EtherSwitch service modules can be in the same switch stack.

In this switch stack, the Catalyst switch or the Cisco EtherSwitch service module can be the stack master. Catalyst S Control Plane Protection Catalyst S switches internally support up to 16 different control plane queues. AutoQoS Error: ciscophone input service policy was not properly applied.

Device Manager Notes You cannot create and manage switch clusters through the device manager. When the switch is running a localized version of the device manager, the switch displays settings and status only in English letters. Input entries on the switch can only be in English letters. For device manager session on Internet Explorer, popup messages in Japanese or in simplified Chinese can appear as garbled text.

We recommend this browser setting to speed up the time needed to display the device manager from Microsoft Internet Explorer. From Microsoft Internet Explorer: 1. Click OK. The HTTP server interface must be enabled to display the device manager.

By default, the HTTP server is enabled on the switch. If you are not using the default method of authentication the enable password , you need to configure the HTTP server interface with the method of authentication used on the switch Beginning in privileged EXEC mode, follow these steps to configure the HTTP server interface:.

To view the details of a caveat listed in this document: 1. CSCtj Catalyst and switches Mediatrace does not report statistics on the initiator under these conditions: — The responder is a mixed switch stack with a Catalyst as the master switch — The ingress interface on the responder from the initiator is on a member switch.

CSCtr ASP now uses a device classifier, which determines the type of device that is connected to the switch. CSCub Catalyst , Cv2, C, and Cv2 switches In a switch stack, multicast traffic can be lost for up to 60 seconds when the master switch is reloaded.

CSCui Catalyst Switch When sampled NetFlow is configured with the command ip flow monitor fm-3 in , the sampler tables are not exported to the collector. The above traceback is not harmful but is expected There is no workaround. CSCuu The switch experiences continuous traceback and CPU hog when you configure the scheduler max-task-time command.

Caveat ID Number. Bug ID. The configuration is as show below: kron occurrence Daily-writeNet at recurring policy-list writeNet! CSCts When rsh command constructs are used within Tclscript, Tcl fails to send the router hostname which causes the rsh command constructs to fail authorization to a remote router. CSCuc Catalyst s When a 1 gig sfp is inserted in a fuller stack with sierra as master, running the sh inventory command does not display the inserted sfp details of the member switch.

CSCum In a Catalyst X switch stack, the switches experience a slow performance with the following message. Expected during linecard OIR The issue is observed in switches running CSCun After system reload, ip ssh source-interface shows in startup-config but disappears from running-config. Save the configuration and reload 5. CSCuo Catalyst s, sf, c and When port-security is configured on all ports and when the end host is moved, the mac address table is out of sync.

The workaround is to clear the mac address table. The workaround is to disable one of the following: — Port-security — Voice Vlan on the interface remove voice vlan config from the interface CSCup Catalyst s, sf, sm and Due to a timing issue, the port channel member port on the slave switch of the stack loops during boot up. The workaround is to remove the VTP password. CSCuq 10G link convergence is better than 1G convergence during link pull or link down.

CSCua Catalyst Switches and When you configure Flex Link on stacks containing interfaces from different switches, the interfaces start flapping continuously. CSCug Catalyst Switch S Configuring logging buffered [size] command with large buffer size causes the switch to experience an out of memory or low memory condition. There is no workaround needed. CSCui Web authentication does not work. The workaround is to disable EnergyWise.

The workaround is to implement SNMP view using the following commands: snmp-server view cutdown iso included snmp-server view cutdown at excluded snmp-server view cutdown ip. The workaround is to apply protocol filters to the device sensor output by entering the following global configuration commands: no macro auto monitor device-sensor filter-spec dhcp exclude all device-sensor filter-spec lldp exclude all device-sensor filter-spec cdp exclude all If the memory leak continues in the “DHCPD Receive” process, disable the built-in DHCP server by entering the no service dhcp global configuration command.

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