Dark Fiber connectivity

[Rizwan]

Hi, 

There is a strange problem between two data centers having dark fiber connectivity. Data center-1 has Cisco nexus pair of switches and

data center-2  has Cisco 4500 pair of switches. HSRP is running on both sides the issue is at nexus side the active nexus IP some times ping and some times does not ping. It also makes VIP at nexus hsrp side down. Even arp is not available at that side for only the one side. The standby switch is ping able always. any suggestion

[Reza Sharifi]

Hi,

Can you post the HSRP configs from both Nexus switches for one or 2 vlans with issues?

Are you running HSRP ver 2?

HTH

[Rizwan]

hsrp v2

interface Vlan255
  no ip redirects
  ip address 10.13.255.2/24
  ip directed-broadcast
  no ipv6 redirects
  ip ospf passive-interface
  ip router ospf 100 area 0.0.0.1
  hsrp 255 
    preempt 
    ip 10.13.255.1 

interface Vlan300
  no ip redirects
  ip address 10.13.3.2/24
  ip ospf passive-interface
  ip router ospf 100 area 0.0.0.1
  hsrp 235 
    preempt 
    ip 10.13.3.1 

interface Vlan255
  ip address 10.13.255.3/24
  ip directed-broadcast
  no ipv6 redirects
  ip ospf passive-interface
  ip router ospf 100 area 0.0.0.1
  hsrp 255 
    preempt 
    ip 10.13.255.1 

interface Vlan300
  no ip redirects
  ip address 10.13.3.2/24
  no ipv6 redirects
  ip ospf passive-interface
  ip router ospf 100 area 0.0.0.1
  hsrp 235 
    preempt 
    ip 10.13.3.1 

[Ganesh Hariharan]

Hi, 

There is a strange problem between two data centers having dark fiber connectivity. Data center-1 has Cisco nexus pair of switches and

data center-2  has Cisco 4500 pair of switches. HSRP is running on both sides the issue is at nexus side the active nexus IP some times ping and some times does not ping. It also makes VIP at nexus hsrp side down. Even arp is not available at that side for only the one side. The standby switch is ping able always. any suggestion

Hi Rizwan,

Is these Nexus devices are in vPC pairs, If yes as part of recommended practice and based on configuration you should configure HSRP on the primary vPC peer device as active and HSRP on the vPC secondary devices as standby.

Hope it Helps..

-GI

Rate if it Helps