Cisco Cisco IOS Software Release 12.2(27)SBC

To display diagnostic information about the Segment Switching Manager (SSM) for switched Layer 2 
segments, use the debug ssm command in privileged EXEC mode. To disable debugging, use the no 
form of this command.

debug ssm {cm errors | cm events | fhm errors | fhm events | sm errors | sm events | sm counters 

| xdr}

no debug ssm {cm errors | cm events | fhm errors | fhm events | sm errors | sm events | sm 

counters | xdr}

Privileged EXEC

The SSM manages the data-plane component of the L2VPN configuration. The CM tracks the 
connection-level errors and events that occur on an xconnect. The SM tracks the per-segment events and 
errors on the xconnect. 

Use the debug ssm command to troubleshoot problems in bringing up the data plane.

This command is generally used only by Cisco engineers for internal debugging of SSM processes. 

The following example shows sample output for the debug ssm xdr command. 

Router# debug ssm xdr 

SSM xdr debugging is on

2w5d: SSM XDR: [4096] deallocate segment, len 16

Displays Connection Manager errors. 

Displays Connection Manager events. 

Displays Feature Handler Manager errors.

Displays Feature Handler Manager events.

Displays Segment Handler Manager errors.

Displays Segment Handler Manager events.

Displays Segment Handler Manager counters.

Displays external data representation (XDR) messages, which have to do 
with traffic being sent across the backplane between route processors and 
linecards. 

12.0(26)S

This command was introduced.

12.2(25)S

This command was integrated to Cisco IOS Release 12.2(25)S.

12.2(28)SB

This command was integrated into Cisco IOS Release 12.2(28)SB.