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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.