Datasheet

145
Release Notes for Cisco IOS Release 12.1E on the Catalyst 6500 and Cisco 7600 Supervisor Engine and MSFC
OL-2310-11
Caveats
• With Per-VLAN-Spanning Tree (PVST) configured, if you remove a DFC-equipped switching
module, other DFC-equipped switching modules might retain some Layer 2 address entries for the
removed module. Traffic loss occurs when the remaining DFC-equipped switching modules send
traffic to the removed module. This problem is resolved in Release 12.1(26)E1. (CSCef84129)
• Layer 2 EtherChannels configured with ports on different DFC-equipped switching modules
periodically purge and refresh their Layer 2 address tables. Typically, the refresh takes a few seconds
as the EtherChannel learns the destination MAC addresses, during which time the EtherChannel
floods all egress traffic to other ports in the VLAN as unknown unicast traffic. With a Layer 2
EtherChannel configured with ports on different DFC-equipped switching modules, the
EtherChannel might flood traffic for several minutes. This problem is resolved in
Release 12.1(26)E1. (CSCeg39091)
• With a Supervisor Engine 2, a memory leak might occur in the medium buffers. This problem is
resolved in Release 12.1(26)E1. (CSCsa47573)
• If you enter the logging event link-status interface command for a Layer 2 port-channel interface
and save the configuration, the command is not present in the configuration file following bootup or
a reload. This problem is resolved in Release 12.1(26)E1. (CSCsa48616)
Resolved General Caveats in Release 12.1(26)E
• In VTP transparent mode, the VLAN database might be lost after a VTP configuration error occurs.
This problem is resolved in Release 12.1(26)E. (CSCef47414)
• When an EXEC session is at the “More” prompt, the session fails to time out. This problem is
resolved in Release 12.1(26)E. (CSCef35192)
• SNMP traps are sent for every Internet Key Exchange (IKE) timeout and rekey but not for every
IPsec timeout and rekey. This situation might generate many false alerts that an IKE tunnel is down
when the IKE tunnel is torn down but immediately rebuilt. Releases where CSCee91044 is resolved
do not send SNMP traps that are sent for normal IKE operation. This problem is resolved in
Release 12.1(26)E. (CSCee91044)
• Several MIB entity tables share one entCacheFlag and under rare circumstances, accessing the MIB
entity tables might cause an entCacheFlag state that is not valid for all the MIB entity tables and a
reload might occur. This problem is resolved in Release 12.1(26)E. (CSCeg19038)
• With OSPF routing configured, and with default routes learned from multiple autonomous system
boundary routers (ASBRs) as equal cost paths, reconfiguring the cost of one of the interfaces for the
default routes does not correctly update the routing table. This problem is resolved in
Release 12.1(26)E. (CSCee16068)
• A Cisco device running Cisco IOS and enabled for the Border Gateway Protocol (BGP) is
vulnerable to a Denial of Service (DoS) attack from a malformed BGP packet. Only devices with
the command ‘bgp log-neighbor-changes’ configured are vulnerable. The BGP protocol is not