Users Guide

Congure PVST+ on VLT Peers to Prevent Forwarding Loops (VLT Peer 2)
Dell_VLTpeer2(conf)#protocol spanning-tree pvst
Dell_VLTpeer2(conf-pvst)#no disable
Dell_VLTpeer2(conf-pvst)#vlan 1000 bridge-priority 4096
Congure both ends of the VLT interconnect trunk with identical PVST+ congurations. When you enable VLT, the show
spanning-tree pvst brief command output displays VLT information (refer to Verifying a VLT Conguration).
Dell#show spanning-tree pvst vlan 1000 brief
VLAN 1000
Executing IEEE compatible Spanning Tree Protocol
Root ID Priority 0, Address 90b1.1cf4.9b79
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 0, Address 90b1.1cf4.9b79
We are the root of Vlan 1000
Configured hello time 2, max age 20, forward delay 15
Interface Designated
Name PortID Prio Cost Sts Cost Bridge ID PortID
---------- -------- ---- ------ ----------- ------- -------------------- --------
Po 1 128.2 128 188 FWD(vltI) 0 0 90b1.1cf4.9b79 128.2
Po 2 128.3 128 2000 FWD(vlt) 0 0 90b1.1cf4.9b79 128.3
Te 1/10 128.230 128 2000 FWD 0 0 90b1.1cf4.9b79 128.230
Te 1/13 128.233 128 2000 FWD 0 0 90b1.1cf4.9b79 128.233
Interface
Name Role PortID Prio Cost Sts Cost Link-type Edge
---------- ------ -------- ---- ------- ----------- ------- --------- ----
Po 1 Desg 128.2 128 188 FWD 0
(vltI)P2P No
Po 2 Desg 128.3 128 2000 FWD 0
(vlt) P2P No
Te 1/10 Desg 128.230 128 2000 FWD 0 P2P Yes
Te 1/13 Desg 128.233 128 2000 FWD 0 P2P No
Dell#
VLT Sample Conguration
To review a sample VLT conguration setup, study these steps.
1. Congure the VLT domain with the same ID in VLT peer 1 and VLT peer 2.
VLT DOMAIN mode
vlt domain domain id
2. Congure the VLTi between VLT peer 1 and VLT peer 2.
3. You can congure LACP/static LAG between the peer units (not shown).
CONFIGURATION mode
interface port-channel port-channel id
NOTE: To benet from the protocol negotiations, Dell Networking recommends conguring VLTs used as facing
hosts/switches with LACP. Ensure both peers use the same port channel ID.
4. Congure the peer-link port-channel in the VLT domains of each peer unit.
INTERFACE PORTCHANNEL mode
channel-member
5. Congure the backup link between the VLT peer units (shown in the following example).
6. Congure the peer 2 management ip/ interface ip for which connectivity is present in VLT peer 1.
EXEC Privilege mode
show running-config vlt
7. Congure the peer 1 management ip/ interface ip for which connectivity is present in VLT peer 1.
Virtual Link Trunking (VLT)
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