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Cisco Bug: CSCun98476 - NXOS missing HSRP command to verify group members in Listen state.

Last Modified

May 05, 2016

Products (7)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch

Known Affected Releases

6.2(2)

Description (partial)

Symptom:
1. NXOS missing HSRP command to verify group members in Listen state.

2 .When N7K switch is in HSRP listen state it is not seen ?show standby neighbors? on an IOS switch, N7K switch is visible to IOS devices only when N7K is in HSRP active or HSRP standby.

Details as follows -

Topology:

Three Switches -  N7K-1, Cat6K-1 and Cat6K-2 in an HSRP group.

When N7K-1 ? Standby (or Active)
Cat6k-1 ? Active
Cat6k-2 ? Listen

Then:-  N7K-1 is in ?show standby neighbor"

BGL.L.15-6500-1#show standby neighbors
HSRP neighbors on Vlan400
  10.126.145.40
    Active groups: 1
    No standby groups
  10.126.145.70    <<<<<< N7K-1 IP
    No active groups
    No standby groups
    Passive timer expires in 159

Problem state:

When N7K-1 ? Listen
Cat6k-1 ? Active
Cat6k-2 ? Standby

N7K-1# show hsrp brief
                     P indicates configured to preempt.
                     |
Interface   Grp Prio P State    Active addr      Standby addr     Group addr
Vlan400     1   10     Listen   10.126.145.40    10.126.145.3     10.126.145.1    (conf)

 Then:- N7K-1 is not in ?show standby neighbor? on Cat6k-1 or Cat6k-2

Conditions:
1. NXOS don't have any equivalent command which we have in IOS "show standby neighbors vlan" to discover/list the group members in Listen State.

2.From debugs on Cat6k - IOS sends passive hello messages in listen mode, however debugs from N7K doesn't send passive hello message. As per the debugs on the IOS when its in the HSRP listen state it sends below packet telling the other HSRP peers that its in the listen state.

Apr 24 11:32:05.932: HSRP: Vl400 Interface adv out, Passive, active 0 passive 1

We do not see the same for the nexus on its debugs.
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