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•
trunk (inter-switch PVLAN hub port)
5
Access INTERFACE VLAN mode for the VLAN to which you want to assign the PVLAN interfaces.
CONFIGURATION mode
interface vlan vlan-id
6
Enable the VLAN.
INTERFACE VLAN mode
no shutdown
7
To obtain maximum VLT resiliency, configure the PVLAN IDs and mappings to be identical on both the
VLT peer nodes. Set the PVLAN mode of the selected VLAN to primary.
INTERFACE VLAN mode
private-vlan mode primary
8
Map secondary VLANs to the selected primary VLAN.
INTERFACE VLAN mode
private-vlan mapping secondary-vlan vlan-list
The list of secondary VLANs can be:
•
Specified in comma-delimited (VLAN-ID,VLAN-ID) or hyphenated-range format (VLAN-ID-
VLAN-ID).
•
Specified with this command even before they have been created.
•
Amended by specifying the new secondary VLAN to be added to the list.
Proxy ARP Capability on VLT Peer
Nodes
The proxy ARP functionality is supported on VLT peer nodes.
A proxy ARP-enabled device answers the ARP requests that are destined for another host or router. The local
host forwards the traffic to the proxy ARP-enabled device, which in turn transmits the packets to the
destination.
By default, proxy ARP is enabled. To disable proxy ARP, use the no proxy-arp command in Interface mode.
To re-enable proxy ARP, use the ip proxy-arp command in Interface mode. To view if proxy ARP is
enabled on the interface, use the show config command in INTERFACE mode. If it is not listed in the show
config command output, it is enabled. Only nondefault information displays in the show config command
output.
An ARP proxy operation is performed on the VLT peer node IP address when the peer VLT node is down. The
ARP proxy stops working either when the peer routing timer expires or when the peer VLT node goes up.
Layer 3 VLT provides a higher resiliency at the Layer 3 forwarding level. VLT peer routing allows you to replace
VRRP with routed VLT to route the traffic from Layer 2 access nodes. With proxy ARP, hosts can resolve the
MAC address of the VLT node even when VLT node is down.
Virtual Link Trunking (VLT)
1161
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Troubleshooting
