Specifications

128
Caveats for Cisco IOS Release 12.0
78-6455-12
Resolved Caveats—Cisco IOS Release 12.0(3)
• CSCdj88650
If OSPF has both an external and a summary route to the same network, and a partial SPF run
deletes the summary route, the external route is not installed. The external LSA might have the
routing bit set, even if it is not installed in the routing table. This is caused by a failure to reset the
external’s routing bit when the summary route replaces the external route in the IP routing table.
The following sequence of events illustrates the problem, given external and summary routes to
network 1.0.0.0:
1. ospf installs external route to 1.0.0.0. The external LSA for 1.0.0.0 has its routing
bit set 2. ospf installs summary route to 1.0.0.0, replacing the external route. The
routing bit is not reset on the external LSA for 1.0.0.0. 3. ospf performs a partial
spf to remove the summary route to 1.0.0.0. The external route to 1.0.0.0 is not
installed. To add to the confusion, the routing bit is still set on the external LSA
for 1.0.0.0.
Issuing the clear ip route * command forces the installation of the external route. Alternatively,
issuing the clear ip ospf redist command at the router that originates the external route triggers
installation of the external route.
• CSCdk14556
Occasionally a router in standby state responds incorrectly to a proxy ARP request. It puts the
virtual MAC address in the ARP data field, which is correct. But it also puts the virtual MAC
address in the MAC header, which is incorrect. The result is that a switch might associate the virtual
MAC with the wrong port, and packets are no longer sent to the active router.
If the active and standby routers are on different ports on a switch, the switch learns the virtual
MAC address from both of them and might thrash its MAC layer cache.
Workaround: Disable proxy ARP.
• CSCdk22030
When there are many peers with many routes, some established peers might time out when a Cisco
router is extremely busy. This condition might occur after you issue the clear ip bgp * command
or after a reload. It might take more time for all the BGP peers to converge. This is a scalability
issue.
Workaround: Avoid the clear ip bgp * command if possible.
• CSCdk33769
Under EIGRP, the command distribute-list out [routing protocol] does not work. The
distribute-list out command does work without specifying the routing protocol option. There is no
workaround.
• CSCdk34549
A slow memory leak is seen in a BGP router running Cisco IOS Release 11.2(14)P. There is no
workaround.
• CSCdk49790
PPP peer neighbor routes from an unnumbered link might remain in the topology table when the
link is down or changed to numbered. This condition causes instability in the network.
Workaround: Remove the EIGRP process and reconfigure it, or reload the router.
• CSCdk60659
The privileged clear access-template command fails if you use the wild card any as the address and
network mask values. There is no workaround.