Administrator Guide

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.
NOTE: After saving the configurations to the startup-config, reload the system with unit ID 1. This is mandatory and
proceed with further configurations after reloading the system.
6. Add VLTi for the election to happen between the systems.
7. System A and system B become VLT peers after the election of primary and secondary VLT units.
8. The PE connected to primary is online and PE to secondary remains offline.
9. Import the configurations of peer systems in both primary and secondary CBs by using the import peer-config
command. This ensures that the provisioning and interface configurations of the PE connected to the peer chassis are
imported into the running configurations of the respective CBs.
EXEC Privilege mode
Port Extenders (PEs)
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