Cisco OL-4015-08 Bedienungsanleitung PDF herunterladen (Seite 332)

684

Cross-Platform Release Notes for Cisco IOS Release 12.0S

OL-1617-14 Rev. Q0

Caveats

Resolved Caveats—Cisco IOS Release 12.0(32)S

Workaround: There is no workaround. To reduce the chance of the router crashing, change the

screen-length argument in the terminal length screen-length command to 0. Doing so prevents the

router from pausing between multiple output screens. (The default of the screen-length argument

is 24.)

• CSCei29398

Symptoms: A standby RP crashes when you add or remove classes from a QoS policy or when a

policy is applied to one line rather than to multiple lines.

Conditions: This symptom is observed on a Cisco 12000 series but is platform-independent.

Workaround: There is no workaround.

• CSCei30764

Symptoms: A PE router that is configured with many (100 or more) Multicast VRFs (mVRFs) may

create multiple MDT tunnels for one mVRF.

Conditions: This symptom is observed when you reload a Cisco router that functions as a PE router

and that is configured for MVPN.

Workaround: There is no workaround.

• CSCei31560

Symptoms: When a multilink bundle is configured on a 6-port channelized T3 line card, the delay

for traffic in the priority queue may be 12 to 14 milliseconds more than what you would expect.

Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release 12.0S

when a multilink protocol such as MFR or MLP is configured and when congestion occurs.

Workaround: There is no workaround.

• CSCei35132

Symptoms: When a link failure occurs between two provider (P) routers, the LSP that is protected

via Fast Reroute (FRR) for a primary tunnel and the directed LDP session within the tunnel are

fast-rerouted onto an assigned backup tunnel. However, when the backup tunnel goes down, VPN

prefixes that are protected by backup TE LSP entries in the LFIB become “Untagged.” This situation

causes packet loss for AToM and L3VPN traffic that uses the link between the P routers as its

primary path.

Conditions: These symptoms are observed on a Cisco 12000 series that runs Cisco IOS

Release 12.0(31)S, that functions as a P router, and that is connected to another P router via a 4-port

OC-3 ISE line card.

The topology is as follows:

PE ------ P --- OC-3 --- P ------ PE

There are one-hop primary tunnels between every pair of routers that is listed above, and each link

is protected by an NHOP backup tunnel LSP.

The symptom occurs when you pull the TX fiber cable from the 4-port OC-3 ISE line card that forms

the protected link between the two P routers, when the protected LSP is fast-rerouted onto the

backup tunnel, and when the backup tunnel is torn down. One P router may show “Untagged” entries

in its LFIB, especially for a loopback interface to a provider edge (PE) router. This situation breaks

the forwarding for all of the L2 and L3 VPNs that depend on that PE router.

The symptom is timing-dependent. The symptom does not occur all the time and does not seem to

be Cisco 12000 series line card-dependent, nor is it specific to a link between the two P router

because the symptom may also occur when you pull the TX fiber cable of a line card that forms the

link between a PE router and a P router.

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