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Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Caveats
Resolved Caveats—Cisco IOS Release 12.0(33)S3
• CSCsw35638
Symptoms: When a Cisco router is the Merge Point (MP) for a protected TE tunnel, and FRR is
triggered, two things happen:
–
The primary LSP goes down, and traffic is lost on the protected tunnel.
–
Any PLR that is downstream of the failure will lose its backup.
Conditions: When a competitor’s router is a point of local repair (PLR) and a Cisco router is a merge
point, then when FRR is triggered, the Cisco router drops the backup tunnel (in some cases
immediately and in other cases after 3 minutes). This causes the primary tunnel that is protected by
this backup to go down. The issue has been identified as related to the fact that session attribute flags
(link/node protection desired) are being cleared by the competitor PLR when the Path is sent over
the backup tunnel.
Workaround: There is no workaround.
• CSCsw47346
Symptoms: A switchover cannot be performed on a Cisco 7500 router.
Conditions: This symptom is observed when test crash is issued on a VIP console.
Workaround: There is no workaround.
• CSCsw47868
Symptoms: An IPv6 ping fails on an E3 Gigabit line card because of a PRECAM 1 Exception.
Conditions: This issue pertains to the dropping of IPv6 packets because of a precam exception on
the egress side. It looked as if the profile for IPv6 was wrong when IPv4 QoS was already applied
even on different subinterfaces on the same port.
Workaround:
1) Add/Remove an ACL.
2) Add/Remove the subinterface.
• CSCsw51017
Symptoms: In the case of egress MVPN QoS, some packets are going to the wrong queue.
Conditions: This symptom is observed with an egress MVPN QoS configuration.
Workaround: There is no workaround.
• CSCsw64956
Symptoms: The no ppp lcp fast-start command is added to all PPP-encapsulation interfaces.
Conditions: This symptom is observed after a router is upgraded from Cisco IOS
Release 12.0(32)SY7 to the latest 32sy throttle image.
Workaround: There is no workaround.
• CSCsw69322
Symptoms: Given the following topology:
PE1 (CT32/2/1) <------- > (CT34/0/1) CE1
Configuring t1 <1-28> loopback remote line feac at PE1 and then removing the loopback causes the
serial interface at CE1 to start flapping continuously.
Conditions: All the interfaces should be up and running.
Workaround: There is no workaround.
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