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Which EXOS Commands can be used to detect a loop?

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TitleWhich EXOS Commands can be used to detect a loop?
Question
Which commands can be used to detect a loop?
Environment
EXOS All
Answer
Type clear l2stats, then show l2stats.

From the output of show l2stats (see example below, highlighted), determine which VLANs have a large number or packets going to the CPU. These are the VLANs to run ELRP on.

 
X460-48x.1 # show l2stats
Bridge interface on VLAN Default:
Total number of packets to CPU = 3097185.
Total number of packets learned = 0.
Total number of MPLS PW packets examined = 0.
Total number of MPLS PW packets learned = 0.
Total number of IGMP control packets snooped = 0.
Total number of IGMP data packets switched = 0.
Total number of MLD control packets snooped = 0.
Total number of MLD data packets switched = 0.

Type enable elrp-client
  • Enables the Extreme Loop Recovery Protocol (ELRP) client (standalone ELRP) globally.

Type configure elrp-client one-shot <vlan_name> ports all print-and-log
  • Starts one-time, non-periodic ELRP packet transmission on the specified ports of the VLAN.
Additional notes
  • vlan_name:  Specifies a VLAN name.
  • ports:  Specifies the set of VLAN ports for packet transmission.
  • all: Specifies all ports of this VLAN for packet transmission.
  • print-and-log:  Specifies that a message should be logged in the system log file and printed to the console when ELRP packets are received back indicating detection of network loop, or no packets are received within the specified duration.
For more information on ELRP, see What is ELRP? 

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