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Enabling VLAN Trunk Protocol (VTP�) Snooping on the Avaya Multiservice switch allows it to automatically synchronize its VLAN configuration with that of a Cisco VTP server switch. VTP is a Cisco� layer 2 protocol used to maintain VLAN configuration consistency among switches. Both switches must be on the same network, have at least VLAN 1 (Default) bound to a connecting link that is forwarding according to the Spanning Tree Protocol, and both ends of the link have the same Trunk Mode setting. Valid Trunk Mode options that work with VTP Snooping are Cisco Inter-Switch Link (Multi-layer) and IEEE 802.1Q.
VLAN additions, deletions, and name changes made on the network's Cisco VTP server are automatically updated on Avaya Multiservice switches that have VTP Snooping enabled and are connected to the Cisco VTP server with the same VTP Domain name. VLAN changes made on an Avaya Multiservice switch are not automatically updated on any other switch. Please note that VTP- learned VLANs may not be modified or deleted on an Avaya Multiservice switch while VTP is enabled. This restriction is in place to help maintain VLAN configuration consistency among VTP Snooping switches within the VTP Domain. Also the Avaya Multiservice switch handles VLAN name or VLAN ID conflicts between itself and a VTP server by giving locally configured VLANs precedence. For example if a VLAN ID or VLAN name is received in a VTP message that is also configured locally on an Avaya Multiservice switch, the VTP message's VLAN information is ignored for that VLAN and a message is entered in the switch's event log indicating the condition.
Note: When VTP Snooping creates VLANs on the Avaya Multiservice switches, the hash table size for the VLANs is automatically set to 64. Depending on the number of VLANs that are created, you may need to manually change this hash table setting. For information on the relationship between hash table sizes and the number of VLANs that are configured on the switch, see "Relationship between VLANs, AFT and Hash Table Sizes," in Chapter 9:�Managing the Address Forwarding Table.
VTP Snooping is Disabled by default. You only need to change VTP Snooping port settings if you want to Enable its ability to learn VLAN changes from a Cisco VTP server.
You can configure VTP snooping from either the Web Agent or the CLI.
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