Hi all

I will send the configs of both vpc, and Domains. and Im shure I did not enable the ip arp sync. 

Thanks.

Hi all,

This is the config for the vpc domain and it ths very standar.

configure terminal

 vpc domain 10

!

My question is I have mode then 1 domain should I configure the ip arp syn on all of them?

thanks. 

Hi all, This is the config for the vpc domain and it ths very standar.configure terminal vpc domain 10 !My question is I have mode then 1 domain should I configure the ip arp syn on all of them?thanks. 

Hello,

vPC domain would be 1 with having two switches. So you configure the belwo under domain 10.

N7k1switch#conf t

N7k1switch(config)#vpc domain 10

N7k1switch(config-vpc-domain)#ip arp synchronize

Hope it Helps..

-GI

Rate if it Helps

Hi  all,

I addeds to the vpc domain I have the "ip arp synchronize" but still not seeing all the same macs in both devices.

thanks.

Hello,

What is your show vPC output from both the switches.

-GI

Hello Ganesh,

This is the output.

Site 2

show vpc
Legend:
                (*) - local vPC is down, forwarding via vPC peer-link

vPC domain id                     : 1   
Peer status                       : peer adjacency formed ok      
vPC keep-alive status             : peer is alive                 
Configuration consistency status  : success
Per-vlan consistency status       : success                       
Type-2 consistency status         : success
vPC role                          : secondary                     
Number of vPCs configured         : 2   
Peer Gateway                      : Disabled
Dual-active excluded VLANs        : -
Graceful Consistency Check        : Enabled
Auto-recovery status              : Enabled (timeout = 240 seconds)

!

Site 2

 show vpc
Legend:
                (*) - local vPC is down, forwarding via vPC peer-link

vPC domain id                     : 1   
Peer status                       : peer adjacency formed ok      
vPC keep-alive status             : peer is alive                 
Configuration consistency status  : success
Per-vlan consistency status       : success                       
Type-2 consistency status         : success
vPC role                          : primary                       
Number of vPCs configured         : 2   
Peer Gateway                      : Disabled
Dual-active excluded VLANs        : -
Graceful Consistency Check        : Enabled
Auto-recovery status              : Enabled (timeout = 240 seconds)

Thanks.

Hello Ganesh,

Im still with the issue with the Ip apr syn not showing all the arps. in both devices.

thanks.

Hello Ganesh,Im still with the issue with the Ip apr syn not showing all the arps. in both devices.thanks.1124

Hello ,

Strange, I was doing some research on this peculiar issue.

And what i come to share is  ip arp syncronize  command is more of an updater than a protocol to synchronize the arp tables on both boxes.

The purpose of the feature was whenever the peer-link or SVI went down and came back up, the vPC peers will forward the ARP entries between the boxes so that  to speed the ARP learning between the boxes after a re-convergence.

And what i found how the traffic works is It monitors to vpc peer-link up messages. If up message is seen, each of the switch will push its ARP entries to the other via CFSoE then both will update their ARP table if it is not already present.

and also checks for SVI up msg for updation of local arp entry.

And Normally  ARP aging /deleting /refreshing etc are handled independently by each of the peer so what i feel you will never see the ARP tables in them synchronized.

But have you tried clear ip arp table on both the switches and chekced what is the output.

Hope it Helps..

-GI

Rate if it Helps..