Cisco Cisco ONS 15454 SONET Multiservice Provisioning Platform (MSPP) Notas de publicación

Description: dGRE Tunneling Code cleanup from the initial dGRE commit.

Workaround: There is still a problem with tunnel adjacencies, so a shut/no shut of the tunnel 
interface is required after all cpus have booted.

The following caveats are opened or resolved in Cisco IOS Release 12.2(29)SM.

There are no known open caveats in Cisco Release 12.2(29)SM. 

This section documents the caveats that are resolved in Cisco IOS Release 12.2(29)SM.

CSCsg56935: 

Description: When mixed GSM and UMTS traffic is run on an MLPPP backhaul and the UMTS 
traffic utilization is over 60 percent of the total MLPPP backhaul, then GSM errors are seen and 
GSM packets may not arrive in a timely manner. This happens for the default value of the GSM jitter 
(4 milliseconds) and a UMTS backhaul MTU of 450 bytes. 

Workaround: Recommended configuration changes for such deployments are as follows:

Increase the GSM jitter buffer to a higher value, such as from the default value of 2 to the higher 
value of 8. 

Reduce the maximum transmission unit (MTU) of the UMTS backhaul to produce a side effect 
of a slightly higher CPU utilization. 

Either or both of the workaround configuration changes will fix the problem. A user can choose the 
option that best fits the particular deployment and traffic requirements.

Commands: The following commands are available for the above workaround: 

Router(config-if)#gsm-abis jitter ? 

  <4-2000>  transmit jitter (in milliseconds) 

Router(config-if)#umts-iub backhaul-mtu ? 

  <250-4440>  mtu in byte 

Related documents for implementing the Cisco ONS 15454 Service Module are available on Cisco.com 
and the Documentation DVD.

Use the following URL to access the related documentation on Cisco.com:

Documents related to the Cisco ONS 15454 Service Module include the following guides:

Cisco ONS 15454-SDH Documents