Users Guide

During the booting phase or when the ICL link attempts to come up, a system logging message is recorded if

VLT PVLAN mismatches, PVLAN mode mismatches, PVLAN association mismatches, or PVLAN port mode

mismatches occur. Also, you can view these discrepancies if any occur by using the show vlt mismatch

command.

Interoperation of VLT Nodes in a PVLAN with

ARP Requests

When an ARP request is received, and the following conditions are applicable, the IP stack performs certain

operations.

• The VLAN on which the ARP request is received is a secondary VLAN (community or isolated VLAN).

• Layer 3 communication between secondary VLANs in a private VLAN is enabled by using the ip local-

proxy-arp

command in INTERFACE VLAN configuration mode.

• The ARP request is not received on the ICL

Under such conditions, the IP stack performs the following operations:

• The ARP reply is sent with the MAC address of the primary VLAN.

• The ARP request packet originates on the primary VLAN for the intended destination IP address.

The ARP request received on ICLs are not proxied, even if they are received with a secondary VLAN tag. This

behavior change occurs because the node from which the ARP request was forwarded would have replied

with its MAC address, and the current node discards the ARP request.

Scenarios for VLAN Membership and MAC

Synchronization With VLT Nodes in PVLAN

The following table illustrates the association of the VLTi link and PVLANs, and the MAC synchronization of

VLT nodes in a PVLAN (for various modes of operations of the VLT peers):

Table 82. VLAN Membership and MAC Synchronization With VLT Nodes in PVLAN

VLT LAG Mode PVLAN Mode of VLT VLAN ICL VLAN

Membership

Mac

Synchronizatio

Peer1 Peer2 Peer1 Peer2

Trunk Trunk Primary Primary Yes Yes

Trunk Trunk Primary Normal No No

Trunk Trunk Normal Normal Yes Yes

Promiscuous Trunk Primary Primary Yes No

Virtual Link Trunking (VLT) 1070