UDLD scenario

This scenario describes how to use UDLD on a single physical interface as well as a LAG.

Procedure
  1. On switch A:

    1. 配置UDLD session between switch A and B.

      switch#configswitch(config-if)#interface 1/1/1switch(config-if)#udldswitch(config-if)#exitswitch(config)#

    2. 配置UDLD session between switch A and C.

      switch(config)#interface 1/1/2switch(config-if)#没有关闭switch(config-if)# switch(config-if)#lag 1switch(config-if)#udld interval 400udld interval 1000-90000switch(config-if)#udld mode aruba-os verify-then-forwardswitch(config-if)#udld retries 5switch(config)#exitswitch(config)#接口1/1/3switch(config-if)#没有关闭switch(config-if)# switch(config-if)#lag 1switch(config-if)#udld interval 400udld interval 1000-90000switch(config-if)#udld mode aruba-os verify-then-forwardswitch(config-if)#udld retries 5
  2. On switch B, configure the UDLD session between switch B and A. 
    switch#configswitch(config-if)#interface 1/1/1switch(config-if)#udldswitch(config-if)#exit
  3. On switch C, configure the UDLD session between switch C and A. 
    switch#configswitch(config)#interface 1/1/2switch(config-if)#没有关闭switch(config-if)# switch(config-if)#lag 1switch(config-if)#udld interval 400udld interval 1000-90000switch(config-if)#udld mode aruba-os verify-then-forwardswitch(config-if)#udld retries 5switch(config)#exitswitch(config)#接口1/1/3switch(config-if)#没有关闭switch(config-if)# switch(config-if)#lag 1switch(config-if)#udld interval 400udld interval 1000-90000switch(config-if)#udld mode aruba-os verify-then-forwardswitch(config-if)#udld retries 5
  4. On switch A, verify UDLD configuration by running the commandshow udld. (A packet must arrive on each switch for it to unblock the interface.) 
    switch#show udldAbbreviations: VTF - Verify then forward FTV - Forward then verify NOR - RFC 5171 normal AGG - RFC 5171 aggressive -------------------------------------------------------------------------------------------------------------------------------- Interface UDLD UDLD UDLD UDLD Mode Interval Retries Tx Rx Rx Rx Transitions Config State Substate Link Pkts Pkts Pkts disc. Pkts drop. -------------------------------------------------------------------------------------------------------------------------------- 1/1/1 enabled active Bidirectional unblock FTV 7000 4 0 0 0 0 0 1/1/2 enabled active Bidirectional unblock VTF 400 5 2 2 0 0 1 1/1/3 enabled active Bidirectional unblock VTF 400 5 2 2 0 0 1
    switch#show udldAbbreviations: VTF - Verify then forward FTV - Forward then verify NOR - RFC 5171 normal AGG - RFC 5171 aggressive -------------------------------------------------------------------------------------------------------------------------------- Interface UDLD UDLD UDLD UDLD Mode Interval Retries Tx Rx Rx Rx Transitions Config State Substate Link Pkts Pkts Pkts disc. Pkts drop. -------------------------------------------------------------------------------------------------------------------------------- 1/1/1 enabled active Bidirectional unblock FTV 7000 4 0 0 0 0 0 1/1/2 enabled active Bidirectional unblock VTF 1000-90000 5 2 2 0 0 1 1/1/3 enabled active Bidirectional unblock VTF 1000-90000 5 2 2 0 0 1