Concept Guide

When a VLT node detects peer up, it will not perform proxy ARP for the peer IP addresses. IP address synchronization occurs again
between the VLT peers.
Proxy ARP is enabled only if peer routing is enabled on both the VLT peers. If you disable peer routing by using the no peer-
routingcommand in VLT DOMAIN node, a notication is sent to the VLT peer to disable the proxy ARP. If peer routing is disabled when
ICL link is down, a notication is not sent to the VLT peer and in such a case, the VLT peer does not disable the proxy ARP operation.
When the VLT domain is removed on one of the VLT nodes, the peer routing conguration removal will be notied to the peer. In this case
VLT peer node disables the proxy ARP. When the ICL link is removed on one of the VLT nodes by using the no peer-link command,
the ICL down event is triggered on the other VLT node, which in turn starts the proxy ARP application. The VLT node, where the ICL link is
deleted, ushes the peer IP addresses and does not perform proxy ARP for the additional LAG hashed ARP requests.
Conguring VLAN-Stack over VLT
To congure VLAN-stack over VLT, follow these steps.
1 Congure the VLT LAG as VLAN-stack access or trunk mode on both the peers.
INTERFACE PORT-CHANNEL mode
vlan-stack {access | trunk}
2 Congure VLAN as VLAN-stack compatible on both the peers.
INTERFACE VLAN mode
vlan-stack compatible
3 Add the VLT LAG as a member to the VLAN-stack on both the peers.
INTERFACE VLAN mode
member port-channel port—channel ID
4 Verify the VLAN-stack congurations.
EXEC Privilege
show running-config
Sample conguration of VLAN-stack over VLT (Peer 1)
Congure VLT domain
Dell(conf)#vlt domain 1
Dell(conf-vlt-domain)#peer-link port-channel 1
Dell(conf-vlt-domain)#back-up destination 10.16.151.116
Dell(conf-vlt-domain)#primary-priority 100
Dell(conf-vlt-domain)#system-mac mac-address 00:00:00:11:11:11
Dell(conf-vlt-domain)#unit-id 0
Dell(conf-vlt-domain)#
Dell#show running-config vlt
!
vlt domain 1
peer-link port-channel 1
back-up destination 10.16.151.116
primary-priority 100
system-mac mac-address 00:00:00:11:11:11
unit-id 0
Dell#
960
Virtual Link Trunking (VLT)