Specifications

1114
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(28)S3
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(30)S1 or any other image that includes the fix for caveat CSCsa64782, which is a
preliminary requisite for default-route handling on an Engine 3 line card. The symptom occurs in
the following scenario:
1) You configure BGP to advertise the target address, so the target address is directly known in the
routing table.
2) You remove the advertisement from BGP and return to default routing, with the same source for
the next hop as the platform that was the BGP next hop.
3) You enter the clear ip route network command, with the address of the BGP next hop for the
network argument.
After the transition from non-default routing to default routing, entering the clear ip route network
command, with the address of the next hop for the network argument, causes an inconsistency, and
traffic is forwarded as unlabeled.
Workaround: To restore proper operation, enter the clear ip route 0.0.0.0 command.
• CSCin75746
Symptoms: When you perform an OIR of a PA-MC-8TE1 port adapter or you reload microcode onto
the line card, the line card may generate the following error message and may stop forwarding
traffic:
AC Switching: VIP Xmit failed: DLCI 426 context missing
Conditions: This symptom is observed on a Cisco 7500 series.
Workaround: There is no workaround. To re-enable the line card, enter the tx-queue-limit command
on the affected interface of the line card.
• CSCin87776
Symptoms: Multilink bundles on a Cisco 7500 series may process-switch traffic instead of using
dCEF, causing the CPU usage of the RSP to increase sharply and a CPU hog condition to occur.
Conditions: This symptom is observed when an RPR+ switchover occurs on a Cisco 7500 series that
is configured for HA.(The switchover causes an MLP to flap.) However, the symptom may also
occur on a Cisco 7500 series that has a single RP (so, without a switchover) when an MLP link flaps.
Workaround: There is no workaround. Note that the symptom does not occur when SSO is
configured because the MLP state is maintained.
• CSCin88026
Symptoms: A VIP that is configured for Link Fragmentation and Interleaving may crash during the
“vip_mlp_process_reassemble” process.
Conditions: This symptom is observed on a Cisco router that runs a Cisco IOS interim release for
Release 12.0(31)S when links flaps occur on the port adapter that is installed in the VIP while traffic
is being processed.
Workaround: There is no workaround.
• CSCin88273
Symptoms: After an RPR+ or SSO switchover occurs, an MLP sequence number mismatch may
occur, a ping between back-to-back interfaces may not go through, and the routing protocol through
this link may go down.
Conditions: This symptom is observed on a Cisco 7500 series that is configured for dMLP and RPR+
or SSO.