Technical data

Switching and Routing

Or, assign it to a specific interface:

ServerIron(config)#int e 2

ServerIron(config-if-2)#dhcp-gateway-list 1

Syntax: [no] dhcp-gateway-list <num> <ip-addr>

Multicast

Enabling IP Multicast Traffic Reduction

IP multicast containment allows Brocade switches to limit switching of IP multicast packets to only those ports on

the switch that are identified as IP multicast members. Brocade switches can provide IP multicast containment in

either of the following modes:

• Passive—The switch listens for Internet Group Membership Protocol (IGMP) packets and forwards them to

the appropriate ports.

• Active—The switch actively sends out host queries to identify IP multicast groups on the network and inserts

this information into the IGMP packets.

Routers in the network generally handle host queries. Unless your configuration does not contain a router to

provide this service, use IP multicast containment in the passive mode.

The ServerIron can operate in either an active or passive IP multicast mode. You must save changes to flash

and reset (reload) the switch for the configuration changes to become active.

If configured to be active, the switch will actively send out host queries to identify IP Multicast groups on the

network and insert this information in the IGMP packet. Routers in the network generally handle this operation

If configured to be passive, the switch will only identify the packet as an IGMP packet and forward it accordingly.

To enable IP Multicast Traffic Reduction, enter commands such as the following:

ServerIron(config)#ip multicast passive

ServerIron(config)#write memory

ServerIron(config)#end

ServerIron#reload

Syntax: [no] ip multicast active | passive

Configuring a Multicast Filter

You can filter on all multicast packets or on specific multicast groups.

To configure a Layer 2 multicast filter to filter all multicast groups, then apply the filter to ports 2/4, 2/5, and 2/8,

enter commands such as the following:

ServerIron(config)#multicast filter 1 any

ServerIron(config-mcast-filter-id-1)#exclude-ports e 2/4 to 2/5 e 2/8

ServerIron(config-mcast-filter-id-1)#write mem

To configure a multicast filter to block all multicast traffic destined for multicast addresses 0100.5e00.5200 –

0100.5e00.52ff on port 4/8, enter commands such as the following:

ServerIron(config)#multicast filter 2 any 0100.5e00.5200 ffff.ffff.ff00

ServerIron(config-mcast-filter-id-2)#exclude-ports ethernet 4/8

ServerIron(config-mcast-filter-id-2)#write mem

The software calculates the range by combining the mask with the multicast address. In this example, all but the

last two bits in the mask are “significant bits” (ones). The last two bits are zeros and thus match on any value.

Syntax: [no] multicast filter <filter-id> any | ip udp mac <multicast-address> | any [mask <ip-mask>] [vlan <vlan-

id>]