Administrator Guide

Verify if VLT on Dell-1 is functional
Dell-2#sh vlt brief
VLT Domain Brief
------------------
Domain ID: 1
Role: Secondary
Role Priority: 55000
ICL Link Status: Up
HeartBeat Status: Up
VLT Peer Status: Up
Local Unit Id: 1
Version: 6(3)
Local System MAC address: 90:b1:1c:f4:29:f1
Remote System MAC address: 90:b1:1c:f4:2c:bb
Configured System MAC address: 90:b1:1c:f4:01:01
Remote system version: 6(3)
Delay-Restore timer: 90 seconds
Peer routing : Enabled
Peer routing-Timeout timer: 0 seconds
Multicast peer routing timeout: 150 seconds
Verify if the heartbeat mechanism is operational on Dell-2
Dell-2#sh vlt backup-link
VLT Backup Link
-----------------
Destination: 10.10.10.1
Peer HeartBeat status: Up
Destination VRF: default
HeartBeat Timer Interval: 1
HeartBeat Timeout: 3
UDP Port: 34998
HeartBeat Messages Sent: 8
HeartBeat Messages Received: 8
Use the show vlt detail command to verify that VLT is functional and that the correct VLANs are allowed.
Dell-2#sh vlt detail
Local LAG Id Peer LAG Id Local Status Peer Status Active VLANs
------------ ----------- ------------ ----------- -------------
1 1 UP UP 20
2 2 UP UP 1, 800, 900
The following output displays the OSPF configuration in Dell-2
Dell-2#sh run | find router
router ospf 1
router-id 172.17.1.2
network 192.168.8.0/24 area 0
network 192.168.9.0/24 area 0
network 172.16.1.0/24 area 0
network 192.168.20.0/29 area 0
passive-interface default
no passive-interface vlan 20
While the passive-interface default command prevents all interfaces from establishing an OSPF neighborship, the no passive-
interface vlan 20 command allows the interface for VLAN 20, the OSPF peering VLAN, to establish OSPF adjacencies.
The following output displays that Dell-1 forms neighborship with Dell-2 and R1.
Dell-2#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address
Interface Area
172.17.1.1 1 FULL/DR 00:00:31 192.168.20.1 Vl
20 0
172.15.1.1 1 FULL/DROTHER 00:00:33 192.168.20.3 Vl
20 0
Virtual Link Trunking (VLT)
989