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VIP used as gateway on Nexus switch: Can't be used in extended ping?

Unanswered Question
Nov 27th, 2011
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Hello,


I am troubleshooting an issue about connectivity to a couple boxes.


We have two Nexus switches. From one I can ping the 2 boxes but their MAC address is not shown when I issue "show ip arp [IP_address]".


On the other switch, I see the MAC addresses but cannot ping.


On the switch that ping works, the SVI for the 2 boxes is administratively down (currently investigating the reason why it was disabled). Then the echo requests are being forwarded thru the switch default gateway? Assuming so and to confirm I did a extended ping to one of the boxes, source IP address was the switch default gateway which happens to be a HSRP Virtual Address. Ping succeded, actually it worked when pinging with another ViP as source


On the switch where I can see the servers MAC addresses, I tried the same extended ping (usings the respective default gateway and another ViP), an error message: invalid source address, was returned.


Why this different behavour on 2 peer devices?


Thanks in advance!


SwitchA# show run | i gateway

  peer-gateway

      ip default-gateway 10.42.63.131

      ip default-gateway 10.42.63.131


SwitchB# show run | i gateway

  peer-gateway

      ip default-gateway 10.42.63.131

      ip default-gateway 10.42.63.131

-----------------------------------------------------------------------------------------------------------


Ping from Switch A

Extended commands [no] : yes

Source address or interface : 10.42.63.131

Sending 5, 56-bytes ICMP Echos to 10.42.28.41

Timeout is 2 seconds, data pattern is 0xABCD


64 bytes from 10.42.28.41: icmp_seq=0 ttl=127 time=15.704 ms

64 bytes from 10.42.28.41: icmp_seq=1 ttl=127 time=1.288 ms


Ping from Switch B   

Target IP address or Hostname: 10.42.28.41

Extended commands [no] : yes

Source address or interface : 10.42.63.131

% Invalid source address


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Fabienne Stephanoff Wed, 12/14/2011 - 08:22
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  • Cisco Employee,

Hello David,


We would prob need to do an ELAM on the N7K (assuming this is a 7000) to check the programming via webex. Can you please open a TAC case?


Fabienne

TAC

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