Brocade BigIron RX Series Configuration Guide - Manual (Page 1012)

934 BigIron RX Series Configuration Guide
53-1002484-04
Configuration considerations
28
An MBGP router learns MBGP routes from its neighbors in other ASs. An MBGP router also can
advertise MBGP routes to its neighbors. The Brocade implementation of MBGP enables you to
advertise multicast routes from the following sources:
• Explicitly configured network prefixes
• Static IP multicast routes
• Directly-connected multicast routes redistributed into MBGP.
You can configure an aggregate address to aggregate network prefixes into a single, more general
prefix for advertisement.
MBGP is described in detail in RFC 2858.
Configuration considerations
• MBGP does not redistribute DVMRP routes. It redistributes static routes only.
• You cannot redistribute MBGP routes into BGP4.
• The BigIron RX supports 8192 multicast routes by default. You may need to increase the
maximum number of multicast routes for MBGP. You can configure the device to support up to
153,600 multicast routes.
Configuring MBGP
1. Optional – Set the maximum number of multicast routes supported by the BigIron RX.
2. Enable MBGP by doing the following:
• Enable PIM Sparse Mode (PIM SM) or PIM Dense Mode (PIM DM) globally and on the
individual Reverse Path Forwarding (RPF) interfaces. PIM must be running on the device
in order for the device to send multicast prefixes to other multicast routers.
• Enable BGP4. If this is the first time you have configured BGP4 on this device, you also
need to specify the local AS number.
3. Identify the neighboring MBGP routers.
4. Optional – Configure an MBGP default route.
5. Optional – Configure an IP multicast static route.
6. Optional – Configure an MBGP aggregate address.
7. Optional – Configure a route map to apply routing policy to multicast routes.
8. Save the configuration changes to the startup-config file.
Setting the maximum number of multicast routes
supported
The BigIron RX supports up 1024 – 153,600 multicast routes.
NOTE
This procedure requires a software reload to place the change into effect.