Owner's Manual

787
Chapter 30. vMAN (PBN) 8800 Chassis Switch
configure vman ethertype <value> [primary | secondary]
By default, all vMAN ports use the primary ethertype value.
2. If you plan to use a secondary ethertype, select the secondary ethertype for the appropriate
vMAN ports using the following command:
configure port <port_list> ethertype {primary | secondary}
Configuring IGMP Snooping on a vMAN
Internet Group Management Protocol (IGMP) snooping is introduced in IGMP Snooping on
page 733, and is enabled by default on all VLANs and vMANs. IGMP snooping allows a
switch to forward Layer 2 multicast traffic within a vMAN to only those destinations that
require it.
To use IGMP snooping on a vMAN, you must enable IP multicasting on the vMAN. If your
topology requires a separate VLAN for multicast traffic, some platforms support multicast
traffic on VLAN and vMANs on the same port. The NETGEAR 8800 series switches support
multicast traffic on VLANs and vMANs that share the same port.
To configure multicast support for both a vMAN and a VLAN on the same port of a NETGEAR
8800 series switch, use the following procedure:
1. Enable jumbo frames on the switch.
2. Change the vMAN ethertype to 0x8100 as described in Configuring the Ethertype for vMAN
Ports on page 786.
3. Assign different IP addresses to the VLAN and the vMAN.
4. Enable IP forwarding on both the VLAN and the vMAN.
5. Enable IP multicasting forwarding on both the VLAN and the vMAN.
6. Configure IGMP on both the VLAN and the vMAN.
Note: See Chapter 27, Multicast Routing and Switching for information on
configuring and using multicasting.
After you enable multicast forwarding on the vMAN, you can configure and use IGMP
snooping.
Selecting the Tag Used for Egress Queue Selection
By default, switches that support the enabling and disabling of this feature use the 802.1p
value in the S-tag to direct the packet to the queue on the egress port.
To configure egress queue dot1p examination of the C-tag, use the following command:
enable dot1p examination port [all | <port_list>]
To return to the default selection of using the 802.1p value in the S-tag, use the following
command: