Configuration Guide User guide

1352 FastIron Configuration Guide
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Basic configuration tasks required for BGP4
As a guideline, Layer 3 switches with a 512 MB Management 4 module can accommodate 150
through 200 neighbors, with the assumption that the Layer 3 switch receives about one million
routes total from all neighbors and sends about eight million routes total to neighbors. For each
additional one million incoming routes, the capacity for outgoing routes decreases by around two
million.
Memory configuration options obsoleted by
dynamic memory
Devices that support dynamic BGP4 memory allocation do not require or even support static
configuration of memory for BGP4 neighbors, routes, or route attributes. Consequently, the
following CLI commands and equivalent Web management options are not supported on these
devices:
• max-neighbors <num>
• max-routes <num>
• max-attribute-entries <num>
If you boot a device that has a startup-config file that contains these commands, the software
ignores the commands and uses dynamic memory allocation for BGP4. The first time you save the
device running configuration (running-config) to the startup-config file, the commands are removed
from the file.
Basic configuration tasks required for BGP4
The following sections describe how to perform the configuration tasks that are required to use
BGP4 on the Brocade Layer 3 switch. You can modify many parameters in addition to the ones
described in this section. Refer to “Optional BGP4 configuration tasks” on page 1365.
Enabling BGP4 on the router
When you enable BGP4 on the router, BGP4 is automatically activated. To enable BGP4 on the
router, enter the following commands.
Brocade> enable
Brocade#configure terminal
Brocade(config)#router bgp
BGP4: Please configure 'local-as' parameter in order to enable BGP4.
Brocade(config-bgp-router)#local-as 10
Brocade(config-bgp-router)#neighbor 209.157.23.99 remote-as 100
Brocade(config-bgp-router)#write memory
Changing the router ID
The OSPF and BGP4 protocols use router IDs to identify the routers that are running the protocols.
A router ID is a valid, unique IP address and sometimes is an IP address configured on the router.
The router ID cannot be an IP address in use by another device.
By default, the router ID on a Brocade Layer 3 switch is one of the following: