Dell Brocade DCX, Configuration Manual

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BigIron RX Series Configuration Guide 859
53-1001810-01
Configuring MBGP
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For indirectly-connected routes:
•
Configure static IP multicast routes. The corresponding IP route must be present in the IP
multicast table.
•
Explicitly configure network prefixes to advertise (network command).
NOTE
You can configure the device to advertise directly-connected networks into MBGP using the network
command. You are not required to use redistribution or configure static multicast routes.
Configuring a network prefix to advertise
By default, the device advertises MBGP routes only for the networks you identify using the network
command or that are redistributed into MBGP from IP multicast route tables.
NOTE
The exact route must exist in the IP multicast route table so that the BigIron RX can create a local
MBGP route.
To configure the device to advertise network 207.95.22.0/24 as a multicast route, enter the
following command.
BigIron RX(config-bgp-ipv4m)# network 207.95.22.0 255.255.255.0
Syntax: network <ip-addr> <ip-mask> [route-map <map-name> ] [backdoor] [weight <num> ]
The <ip-addr> is the network number and the <ip-mask> specifies the network mask.
The route-map <map-name> parameter specifies the name of the route map you want to use to set
or change BGP4 attributes for the network you are advertising. The route map must already be
configured.
The backdoor parameter changes the administrative distance of the route to this network from the
EBGP administrative distance (20 by default) to the Local BGP weight (200 by default), thus tagging
the route as a backdoor route.
The weight <num> parameter specifies a weight to be added to routes to this network.
Enabling redistribution of directly-connected multicast routes into MBGP
To redistribute a directly-connected multicast route into MBGP enable redistribution of
directly-connected routes into MBGP, using a route map to specify the routes to be redistributed.
Here is an example.
BigIron RX(config)# access-list 10 permit 207.95.22.0 0.0.0.255
BigIron RX(config)# route-map mbgpmap permit 1
BigIron RX(config-routemap mbgpmap)# match ip address 10
BigIron RX(config-routemap mbgpmap)# exit
BigIron RX(config)# router bgp
BigIron RX(config-bgp-ipv4m)# redistribute connected route-map mbgpmap
The first command configures an IP ACL for use in the route map. The ACL matches on the
destination network for the route to be redistributed. The next four commands configure a route
map that matches on routes to the multicast network specified in IP ACL 10. The device
redistributes routes that match the route map into MBGP.
Syntax: [no] redistribute [connected | static] [metric <num> ] [route-map <map-name> ]