Cisco ASR 903 Release Notes

37
Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
OL-26630-08
Chapter
Caveats in Cisco IOS XE 3.7S Releases
– The router is configured with a T1 interface on the OC-3 interface module (IM)
– The OC-3 interface module uses SONET framing
– The T1 serial interface is part of an MLP bundle
– You change the CRC configuration value of the MLP bundle
Workaround: Follow these steps:
– Remove the T1 interface from the MLP bundle.
– Perform a soft OIR (IM reset) on both ends of the connection.
– Wait for the T1 interface to become active.
– Add the T1 interface back into the MLP bundle.
• CSCub63072
Symptom: MPLS convergence can be slower than expected.
Conditions: Occurs when the router switches to a backup MPLS path in the event of a network
failure.
Workaround: You can configure the following redundancy features to protect against network
failures:
– IPv4 Loop Free Alternate Fast Reroute (LFA FRR)
– Border Gateway Protocol (BGP) Prefix-Independent Convergence (PIC)
– MPLS Traffic Engineering (TE)--Fast Reroute (FRR) Link and Node Protection
• CSCub77354
Symptom: An RSP switchover causes the serial interfaces to flap on the peer device.
Conditions: Occurs when you perform an RSP switchover by physically removing the active RSP.
Workaround: Use the following workarounds:
– Perform an RSP switchover using the redundancy force-switchover command.
Configure the local device to use clock source line and the remote device to use clock source
internal.
• CSCub81445
Symptom: A link remains active while the router shows the line protocol status as down.
Link Stays up with Line Protocol status as down.
Conditions: Occurs when you perform an interface module (IM) OIR, followed by a stateful
switchover (SSO).
Workaround: There is no workaround.
• CSCuc38878
Symptom: The router loops traffic between two nodes in a ring for approximately 100 ms.
Conditions: Occurs during a failover when multiple ASR 903 routers are configured as nodes in a
ring using Remote LFA FRR.
Workaround: There is no workaround.
• CSCuc42085
Symptom: The 1PPS output from the ASR 903 is out of range when compared to the 1PPS output
of the PTP master clock.

Cisco ASR 903 Specifications

General

Brand	Cisco
Model	ASR 903
Category	Network Router
Language	English