Troubleshooting Guide

VSP-4850GTS> show cfm spbm
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Cfm Spbm
========================================================================
LEVEL ADMIN MEP ID MAC
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4 enable 1 00:00:00:00:00:00
Variable definitions
Use the data in the following table to use cfm spbm command.
Variable Value
enable Enables CFM for SPBM VLANs.
level<0–7> Sets the maintenance level for MEP and MIP.
mepid<1–8191> Specifies the MEP ID for all SPBM VLANs.
Triggering a loopback test (LBM)
Use this procedure to trigger a loopback test.
The LBM packet is often compared to ping. An MEP transmits the loopback message to an
intermediate or endpoint within a domain for the purpose of fault verification. This can be used to
check the ability of the network to forward different sized frames.
Before you begin
• You must have a MEP that is associated with a B-VLAN.
Procedure
Trigger the loopback test:
loopback WORD<0–22> WORD<0–22> <1–8191> <0x00:0x00:0x00:0x00:0x00:0x00>
[burst-count <1–200>] [data-tlv-size <0–400>] [frame-size <64–1500>]
[interframe-interval <msecs>] [priority <0–7>] [source-mode <nodal|
noVlanMac|smltVirtual>] [testfill-pattern <all-zero|all-zero-crc|pseudo-
random-bit-sequence|pseudo-random-bit-sequence-crc>] [time-out <1–10>]
Example
VSP-4850GTS# loopback md1 4001 13 00:14:0D:A2:B3:DF burst-count 10
priority 3 time-out 5
Result of LBM from mep: md1.4002.13 to MAC address: 00:14:0D:A2:B3:DF :
Sequence number of the first LBM is 10575
The total number of LBMs sent out is 10
The number of LBRs received is 10
The number of LBRs lost is 0
The percentage of LBMs lost is 0.00%
The RTT Min is 764 microsecs, Max is 800 microsecs, Average is 783.00 microsecs
The RTTDV min is 3 microsecs, Max is 23 microsecs, Average is 9.11 microsecs
The Standard Deviation of RTT is 11.53 microsecs
Operations and Management
January 2017 Troubleshooting 168
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