cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 
drjarmon
New Contributor III

VRRP / VLAN arp address

Jump to solution

End nodes ARP entries are flapping between the VRRP MAC address and the VLAN MAC address.  Each time there's a change, there's a network traffic spike.  Trying to understand why this anomaly is happening.

Thanks

Tags (3)
0 Kudos
1 Solution

Accepted Solutions
jayh
Honored Contributor
Honored Contributor

Re: VRRP / VLAN arp address

Jump to solution

It sounds like a misconfiguration.  The physical VLAN IP must be different on each VRRP device, and the VRRP IP the same on both, also the same group number on both. 

Sample config:

Router 1

interface vlan 6

ip address 10.0.0.2 255.255.255.0

  vrrp 6 ip 10.0.0.1

Router 2

interface vlan 6

  ip address 10.0.0.3 255.255.255.0

  vrrp 6 ip 10.0.0.1

ARP for 10.0.0.2 will be that shown on router 1's VLAN interface.

ARP for 10.0.0.3 will be that shown on router 2's VLAN interface.

ARP for 10.0.0.1 will be 0000.5e00.0106 regardless of which is active.

Last byte of VRRP address is the group number.

View solution in original post

0 Kudos
2 Replies
jayh
Honored Contributor
Honored Contributor

Re: VRRP / VLAN arp address

Jump to solution

It sounds like a misconfiguration.  The physical VLAN IP must be different on each VRRP device, and the VRRP IP the same on both, also the same group number on both. 

Sample config:

Router 1

interface vlan 6

ip address 10.0.0.2 255.255.255.0

  vrrp 6 ip 10.0.0.1

Router 2

interface vlan 6

  ip address 10.0.0.3 255.255.255.0

  vrrp 6 ip 10.0.0.1

ARP for 10.0.0.2 will be that shown on router 1's VLAN interface.

ARP for 10.0.0.3 will be that shown on router 2's VLAN interface.

ARP for 10.0.0.1 will be 0000.5e00.0106 regardless of which is active.

Last byte of VRRP address is the group number.

View solution in original post

0 Kudos
Anonymous
Not applicable

Re: VRRP / VLAN arp address

Jump to solution

:

I went ahead and flagged the "Correct Answer" on this post to make it more visible and help other members of the community find solutions more easily. If you don't feel like the answer I marked was correct, feel free to come back to this post to unmark it and select another in its place with the applicable buttons.  If you have any additional information on this that others may benefit from, please come back to this post to provide an update.  If you still need assistance, we would be more than happy to continue working with you on this - just let us know in a reply.

Thanks,

Levi