Users Guide

Backup RP is not supported if the VLT peer that functions as the RP is statically congured. With static RP conguration, if the RP
reboots, it can handle new clients only after it comes back online. Until the RP returns to the active state, the VLT peer forwards the
packets for the already logged-in clients. To enable the VLT peer node to retain the synchronized multicast routes or synchronized multicast
outgoing interface (OIF) maps after a peer node failure, use the timeout value that you congured using the multicast peer-
routing timeout value command. You can congure an optimal time for a VLT node to retain synced multicast routes or synced
multicast outgoing interface (OIF), after a VLT peer node failure, using the multicast peer-routing-timeout command in VLT
DOMAIN mode. Using the bootstrap router (BSR) mechanism, you can congure both the VLT nodes in a VLT domain as the candidate RP
for the same group range. When an RP fails, the VLT peer automatically takes over the role of the RP. This phenomenon enables resiliency
by the PIM BSR protocol.
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 the 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#
Congure the VLT LAG as VLAN-Stack Access or Trunk Port
Dell(conf)#interface port-channel 10
Dell(conf-if-po-10)#switchport
Dell(conf-if-po-10)#vlt-peer-lag port-channel 10
Dell(conf-if-po-10)#vlan-stack access
876
Virtual Link Trunking (VLT)