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Instructions
The steps in this article are applicable to switches running OS10 that support Virtual Link Trunking. This article does not contain the requirements for VLT, such as running the same software version. It is recommended that a user verifies the requirements for VLT before implementing these steps. Full manuals can be accessed via the support site.
For OS9 configuration, see How to set up Virtual Link Trunking (VLT) on Dell Networking Force10 Switches.
Note: Additional information can be found in Dell EMC Networking How to Update OS10 on a Switch running OS10.
Note: Switch stacking is not supported in OS10. Virtual Link Trunking aggregates two identical physical switches to form a single logical extended switch. This single logical entity ensures high availability and high resilience for all its connected access, core switches, and clients.
VLT Configuration Overview
1. Spanning Tree on the VLT peer switches
2. Create a VLT Domain and Configure the VLT interconnect (VLTi)
3. Configure the VLT Priority, VLT MAC Address, and VLT Backup Link
4. Configure the LAG for the connected device
Spanning Tree on the VLT peer switches
Spanning tree is enabled by default and recommended to prevent loops in VLT domain. RPVST+ (default) and RSTP modes are supported on VLT ports.
OS10# configure terminal
OS10(config)# spanning-tree mode rstp [or] rapid-pvst
Create a VLT Domain and Configure the VLT interconnect (VLTi)
| OS10# configure terminal | Enter configuration mode. |
| OS10(config)# interface range ethernet 1/1/1-1/1/2 | Enter interface configuration mode |
| OS10(conf-range-eth1/1/1-1/1/2)# no switchport | Remove switchport from the VLTi ports. |
| OS10(config)# vlt-domain 1 | Create a VLT domain by configuring the same domain ID on each peer. |
| OS10(conf-vlt-1)# discovery-interface ethernet 1/1/1 | Set the VLTi interfaces. |
| OS10(conf-vlt-1)# discovery-interface ethernet 1/1/2 | Set the VLTi interfaces. |
The “VLT time interval” optional is not covered in this article. Changing the VLT time interval is based on design requirements. In certain environments, the timer may need to be increased to ensure routing protocols come up before VLT converges to prevent possible outages.
Configure the VLT Priority, VLT MAC Address, and VLT Backup Link
| OS10# configure terminal | Enter configuration mode. |
| OS10(config)# vlt-domain 1 | Enter VLT domain configuration mode. |
| OS10(conf-vlt-1)# primary-priority 4096 (primary peer) OS10(conf-vlt-1)# primary-priority 8192 (secondary peer) | Specify the VLT priority for each peer switch. |
| OS10(conf-vlt-1)# vlt-mac 00:11:22:33:44:55 | Specify the VLT MAC address with a unique MAC address. |
| OS10(conf-vlt-1)# backup destination 1.1.1.2 (primary peer) OS10(conf-vlt-1)# backup destination 1.1.1.1 (secondary peer) | Specify the management IP address of the peer switch. This sets up the Heartbeat that monitors system up. |
Each VLT domain in the network must use a separate unique mac address. This mac address must be the same on both switches in the VLT Domain.
Configure a LAG for a connected end device
The following example uses ethernet 1/1/10 on both VLT peers, in a LACP Port-Channel, to connect to one end device.
| OS10# configure terminal | Enter configuration mode. |
| OS10(config)# interface port-channel 5 | Specify the LAG to the end device. Use the same LAG number on both peers. |
| OS10(conf-if-po-5)# vlt-port-channel 5 | Specify the LAG as VLT. |
| OS10(conf-if-po-5)# exit | Exit |
| OS10(config)# interface ethernet 1/1/10 | Enter interface configuration mode. |
| OS10(conf-if-eth1/1/10)# channel-group 5 mode active | Specify the LAG on the port. |
Verify the port channel is Up:
OS10# show vlt 1 vlt-port-detail
VLT port channel ID : 5
VLT Unit ID Port-Channel Status Configured ports Active ports
———————————————————————————-
*1 port-channel5 up 1 1
2 port-channel5 up 1 1
Verifying and Monitoring
OS10# show vlt 1
Domain ID : 1
Unit ID : 1
Role : primary
Version : 1.0
Local System MAC address : 90:b1:1c:f4:xx:xx
VLT MAC address : 00:11:22:33:44:55
IP address : fda5:74c8:xxxx:1::1
Delay-Restore timer : 1000 seconds
Peer-Routing : Disabled
Peer-Routing-Timeout timer : 0 seconds
VLTi Link Status
port-channel1000 : up
VLT Peer Unit ID System MAC Address Status IP Address Version
————————————————————————–
2 90:b1:1c:f4:xx:xx up fda5:74c8:xxxx:1::2 1.0
OS10# show vlt 1 mismatch
Peer-routing mismatch:
No mismatch
VLAN mismatch:
No mismatch
VLT VLAN mismatch:
No mismatch
OS10# show running-configuration vlt
!
vlt domain 1
discovery-interface ethernet 1/1/1
discovery-interface ethernet 1/1/2
primary-priority 4096
vlt-mac 00:11:22:33:44:55
backup destination 1.1.1.2
!
interface port-channel 5
vlt-port-channel 5
Notes to Myself 