Administrator Guide

2. There is a CB connected to PE and a standalone CB. You can physically connect the CBs and then configure them as VLT peers. Then
physically connect the uplink ports of the PE to each of the VLT peers. The system starts functioning as a dual homing setup. Refer to
Standalone System.
3. There are two standalone CBs not connected to PEs. You can physically connect the CBs and then configure them as VLT peers.
Then physically connect the uplink ports of the PE to the VLT peers. The system starts functioning as a dual homing setup. Refer to
Systems without Port Extender.
NOTE: PE up-time reflects the duration of time for which the PE is up. However, during an ICL flap or reload scenario,
PE up-time is not synced between the VLT peers. As a result, both the VLT nodes run their own timers after an ICL flap
or reload occurs.
Systems with Port Extender
The following diagram illustrates PE 1 connected to System A and PE 2 connected to System B.
Figure 109. Systems with Port Extender — Before setting up Dual Homing
You can connect System A and System B and configure them as VLT peers as follows:
1. Ensure that PE IDs of PE 1 and PE 2 are different. The IDs should be unique and cannot overlap during the configuration.
2. Ensure that System A and System B are upgraded to OS 9.10(0.) or later.
3. Enter VLT-domain configuration mode for a specified VLT domain. Ensure that both the systems are configured with the same VLT
domain ID.
CONFIGURATION mode
vlt domain domain-id
The range of domain IDs is from 1 to 1000.
4. Configure the default MAC address for the domain by entering a new MAC address.
VLT DOMAIN CONFIGURATION mode
system-mac mac-address mac-address
The mac-address format is nn:nn:nn:nn:nn:nn.
5. Configure the unique unit ID (0 or 1) to each peer switch.
VLT DOMAIN CONFIGURATION mode
unit-id {0 | 1}
Configure a different unit ID (0 or 1) on each peer switch.
NOTE:
The system MAC and unit ID are the mandatory configurations to be done so that the dual homing functions
properly.
Port Extenders (PEs) 679