Cisco ASR 900 Series Release Notes page 134

Caveats in Cisco IOS XE 3.7S Releases
Symptom: The active RSP displays traceback error messages occurring on the standby RSP.
Conditions: Occurs with the following configuration:
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The issue occurs after you issue a stateful switchover (SSO).
Workaround: Avoid performing an SSO with the configuration described.
CSCud33906
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Symptom: Equal Cost Multipath (ECMP) loopback does not function properly.
Conditions: Occurs when a port-channel link dynamically assigned as an ECMP path.
Workaround: There is no workaround.
• CSCud34346
Symptom: The router crashes.
Conditions: The issue can occur when:
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Workaround: There is no workaround.
CSCud38038
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Symptom: The router records incorrect delay measurements after a reload.
Conditions: Occurs under the following conditions:
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Workaround: You can use the following workarounds:
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• CSCud38115
Symptom: OSPF connections flap and drop traffic for approximately 20 seconds
Conditions: Occurs during stateful switchover (SSO).
Workaround: There is no workaround.
CSCud38419
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Symptom: The router crashes when you apply an access control list (ACL) configuration. The issue
occurs rarely and when the router is configured at a high scale.
Conditions: Occurs when:
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Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
46
The router is configured with 1000 multicast groups
The outgoing interface is a bridge-domain interface (BDI)
All hosts are receiving a high rate of traffic.
The router is configured with multiple ECMP paths
MPLS IP is not enabled on one of the ECMP paths
You configure Delay Measurement Message (DMM) on a port-channel interface.
The port-channel member links are on different interface modules (IMs).
You reload the router.
Remove the ethernet cfm global command and re-apply it after the port-channel member links
recover.
Configure PTP clock synchronization.
You create and apply IPv6 ACLs
You remove the IPv6 ACLs
You replace the IPv6 ACLs with IPv4 ACLs
Chapter
OL-26630-12