Specifications

1188
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(28)S1
Conditions: This symptom is observed on a Cisco 12000 series that has hardware-enabled multicast
configured on a VRF interface.
Workaround: Disable hardware multicast on the VRF interface.
• CSCef31934
Symptoms: In a scaled configuration with hundreds of eBGP peers with very low BGP timers,
issuing clear ip bgp * may increase HW forwarding memory utilization.
Conditions: This problem is seen with 500 eBGP sessions with BGP keepalive timer of 3 seconds
and hold timer of 9 seconds. The router has 200K MPLS VPN routes. This problem is not seen if
the BGP timers are set to the default value.
Workaround: There is no workaround.
• CSCef40187
Symptoms: An SRP interface is stuck and there is no response at all. In the output of the show srp
topology command, the last topology packet that is received takes more than five seconds to arrive.
In addition, the “zero encap length” counter in the output of the show hardware pxf cpu stat
interface srp 1/1 detail command increases.
Conditions: This symptom is observed on a Cisco 10720 when the value of the overall packet size
divided by 32 is 1 or 2.
Workaround: There is no workaround.
• CSCef41460
Symptoms: Generic routing encapsulation (GRE) tunnel may not work on a provider edge (PE)
router if VPN is configured.
Conditions: This symptom is observed on a Cisco 12000 series that runs the gsr-p-mz image of
Cisco IOS Release 12.0(25)S or a later release.
Workaround: There is no workaround.
• CSCef42706
Symptoms: CPU hog, BGP sessions, and APS channels flaps are observed on routers.
Conditions: When SNMP polling a Cisco 12000 series router with about 500
interfaces/subinterfaces, 900+ attached service policies, the router may produce CPUHOG log
messages when polling the Class-Based-QoS-Mib stats.
Workaround: There is no workaround.
• CSCef42815
Symptoms: A flap of the BGP session between a primary provider edge (PE) router and a customer
edge (CE) router that provides the default route may cause a remote CE router to lose Internet
connectivity when the BGP session is restored.
Conditions: This symptom is observed in a topology with CE routers that are dual-homed and
connected to two Cisco 12000 series routers that function as PE routers and that run Cisco IOS
Release 12.0(26)S2 when the default route is generated by a CE router in a different VPN
routing/forwarding (VRF).
Workaround: There are two steps to the workaround:
1. Add a default VRF static route to cover the BGP-derived default route.
2. Clear the default route entry in the routing table.