Administrator Guide

DellEMC(conf-if-vl-50-stack)#member port-channel 10
DellEMC(conf-if-vl-50-stack)#member port-channel 20
DellEMC(conf-if-vl-50-stack)#
DellEMC#show running-config interface vlan 50
!
interface Vlan 50
vlan-stack compatible
member Port-channel 10,20
shutdown
DellEMC#
Verify that the Port Channels used in the VLT Domain are Assigned to the VLAN-Stack VLAN
DellEMC#show vlan id 50
Codes: * - Default VLAN, G - GVRP VLANs, R - Remote Port Mirroring VLANs, P - Primary, C
- Community, I - Isolated
O - Openflow
Q: U - Untagged, T - Tagged
x - Dot1x untagged, X - Dot1x tagged
o - OpenFlow untagged, O - OpenFlow tagged
G - GVRP tagged, M - Vlan-stack
i - Internal untagged, I - Internal tagged, v - VLT untagged, V - VLT tagged
NUM Status Description Q Ports
50 Active M Po10(Gi 1/8)
M Po20(Gi 1/20)
V Po1(Gi 1/30-32)
DellEMC#
Configure BFD in VLT Domain
Dell EMC Networking OS supports Bidirectional Forwarding Detection (BFD) to detect communication failures on an interface
that is a part of a VLT link aggregation group (LAG).
In VLT domain, BFD provides high availability path when there are communication failures in any one of the VLT LAG links. The
VLT nodes and top of rack (ToR) use the VLT LAG links to carry the BFD packets. When any one of the VLT LAG links
connected to the ToR is down, the BFD packets reach the VLT primary or secondary using the VLTi (ICL) link.
When VLT peer-routing is enabled, BFD sessions are not established if BFD packets reach the wrong VLT node due to LAG
hashing in TOR. The wrong VLT node must have ARP or IPv6 neighbor discovery entries for VLT peer node's IPv4 or IPv6
address in the forwarding table, to forward the BFD packet to the VLT peer. Since ARP or IPv6 neighbor discovery entries are
bound to expire, it is recommended to add static ARP or IPv6 neighbor discovery entries for the VLT peer node's IPv4 or IPv6
address, to forward the BFD packets to the correct VLT node.
Sample BFD configuration in VLT domain
The following shows the sample configuration of BFD implementation in VLT environment:
946
Virtual Link Trunking (VLT)