Nexus - HSRP and vPC, connectivity problem.

[zykobot]

Hi,

Hopefully someone has come across this problem before...

The testing topology looks like this:

10.250.2.50 (VLAN 2502) -----> Nexus 2K -----> Nexus 5KA (SVI 2501, 2502) --------> Nexus 2K ------> 10.250.1.50 (VLAN 2501)

LAPTOP A                                           ------> Nexus 5KB (SVI 2501, 2502) ------->                              LAPTOP B

If I shutdown the interface vlan 2501 on Nexus 5K A or reboot Nexus 5K B... no problem, connectivity continues.

However, if I shut down interface vlan 2501 on Nexus 5K B, connectivity stops. Both laptops can still hit their gateways but connectivity between the two ceases... any ideas?

HSRP configuration looks like this..

Nexus 5K 1

interface Vlan2501

  no shutdown

  no ip redirects

  ip address 10.250.1.2/24

  hsrp version 2

  hsrp 2501

    preempt delay minimum 150 reload 300

    priority 150

    timers  1  3

    ip 10.250.1.1

Nexus 5K 2

interface Vlan2501

  no shutdown

  no ip redirects

  ip address 10.250.1.3/24

  hsrp version 2

  hsrp 2501

    preempt delay reload 300

    priority 90

    timers  1  3

    ip 10.250.1.1

vPC is configured like this..

vpc domain 1

  peer-switch

  role priority 2000

  system-priority 4000

  peer-keepalive destination 192.168.10.2 source 192.168.10.1 vrf VPC-KEEPALIVE-VRF

  delay restore 150

  peer-gateway

  auto-recovery reload-delay 300

  ip arp synchronize

[zykobot]

I adjusted the 'preempt' line to match on both sides.. made no difference.

[zykobot]

To add to this.. I put both machines in the same VLAN 2501..

They can ping each other, they can both ping 10.250.1.1 (and SSH to)

However, Laptop B can't see 10.250.1.3 (I shut down 10.250.1.2) but Laptop A can.