Foundry Networks Switch and Router Installation And Configuration Manual page 701

10. Select Enable next to Client To Client Reflection if this neighbor is a route-reflector client of the router. Use
the parameter only if this router is going to be a route reflector. For information, see "Configuring Route
Reflection Parameters" on page 19-37. This option is disabled by default.
11. Select Enable next to Shutdown if you want to administratively shut down the session with this neighbor.
Shutting down the session allows you to completely configure the neighbor and save the configuration without
actually establishing a session with the neighbor. This option is disabled by default.
12. Enter the advertisement interval in the Advert Interval field. This parameter specifies the minimum delay (in
seconds) between messages to the specified neighbor. The default is 30 for EBGP neighbors (neighbors in
other ASs). The default is 5 for IBGP neighbors (neighbors in the same AS). The range is 0 – 600.
13. Edit the value in the Maximum Prefix field to change the maximum prefix. The maximum prefix is the
maximum number of IP network prefixes (routes) that can be learned from the specified neighbor. The
default and maximum configurable values depend on the product type:
• NetIron Internet Backbone router – You can configure a value from 0 – 4294967295. The default is 0
(unlimited).
• BigIron Layer 3 Switch – Same as for the NetIron 400 and NetIron 800.
• TurboIron/8 Layer 3 Switch – Same as for the NetIron 400 and NetIron 800.
• NetIron Stackable Layer 3 Switch – You can configure a value from 100 to the maximum number of
BGP4 routes allowed on the Layer 3 Switch. The default is 5000. The maximum value depends on the
type of Layer 3 Switch you have and also on whether you have changed the maximum number of routes
for the device. See "Changing the Maximum Number of Routes" on page 19-85.
14. Enter the remote AS number in the Remote AS field. The remote AS number is the number of the AS the
neighbor is in.
15. Enter the weight you want the Layer 3 Switch to add to routes received from the specified neighbor. BGP4
prefers larger weights over smaller weights. The default weight is 0.
16. Enter the number of an update source loopback interface in the Update Source field. This parameter
configures the router to communicate with the neighbor through the loopback address on the specified
interface. Using a loopback address for neighbor communication avoids problems that can be caused by
unstable router interfaces. Generally, loopback interfaces are used for links to IBGP neighbors, which often
are multiple hops away, rather than EBGP neighbors. The loopback interface number can be from 1 – 8.
There is no default.
17. Enter a Keep Alive time in the Keep Alive Time field. This parameter overrides the global BGP4 Keep Alive
Time configured on the Layer 3 Switch. You can specify from 0 – 65535 seconds. The default is the current
global setting.
18. Enter a Hold Time in the Hold Time field. This parameter overrides the global BGP4 Hold Time configured on
the Layer 3 Switch. You can specify 0 or 3 – 65535 (1 and 2 are not allowed). If you set the Hold Time to 0,
the router waits indefinitely for messages from a neighbor without concluding that the neighbor is dead. The
default is the current global setting.
NOTE: Set the Hold Time to three times the value of the Keep Alive Time. For information about these
parameters, see "Changing the Keep Alive Time and Hold Time" on page 19-27.
19. If you specified a weight in the Weight field, enter a list of AS Path filters in the AS Path Filter List for Weight
field. The router applies the filters in the order in which you list them and stops applying the filters in the AS-
path filter list when a match is found.
NOTE: By default, if an AS-path does not match any of the filters, the Layer 3 Switch denies the route. To
change the default behavior, configure the last filter as "permit any any".
NOTE: The AS-path filter must already be configured. See "Filtering AS-Paths" on page 19-50.
December 2000
Configuring BGP4
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