Brocade Communications Systems FastIron SX 800 Configuration Manual page 368

Basic configuration tasks required for BGP4
NOTE
The device applies the advertisement interval only under certain conditions. The device does not apply the advertisement
interval when sending initial updates to a BGP4 neighbor. As a result, the device sends the updates one immediately after
another, without waiting for the advertisement interval.
allowas-in num disables the AS_PATH check function for routes learned from a specified location. BGP4 usually rejects routes that
contain an AS number within an AS_PATH attribute to prevent routing loops.
capability as4 [enable | disable ] enables the capability of processing AS4s. The optional keywords enable and disable specify whether
the feature should be changed from its current state. For example, if this neighbor belongs to a peer group that is enabled for AS4s but
you want to disable it on the current interface, use the command and include the disable keyword.
capability orf prefixlist [send | receive ] configures cooperative device filtering. The send and receive parameters specify the support you
are enabling:
• send - The device sends the IP prefix lists as Outbound Route Filters (ORFs) to the neighbor.
• receive - The device accepts filters as Outbound Route Filters (ORFs) from the neighbor.
If you do not specify either send or receive , both capabilities are enabled. The prefixlist parameter specifies the type of filter you want to
send to the neighbor.
NOTE
The current release supports cooperative filtering only for filters configured using IP prefix
lists.
default-originate [route-mapmap-name ] configures the device to send the default route 0.0.0.0 to the neighbor. If you use the route-
map map-name parameter, the route map injects the default route conditionally, based on the match conditions in the route map.
description string specifies a name for the neighbor. You can enter an alphanumeric text string up to 80 characters long.
distribute-list in | out num,num,... specifies a distribute list to be applied to updates to or from the specified neighbor. The in and out
keywords specify whether the list is applied on updates received from the neighbor, or sent to the neighbor. The num,num,... parameter
specifies the list of address-list filters. The device applies the filters in the order in which you list them and stops applying the filters in the
distribute list when a match is found.
To use an IP ACL instead of a distribute list, you can specify distribute-listACL-numin | out . In this case, ACL-num is an IP ACL.
NOTE
By default, if a route does not match any of the filters, the device denies the route. To change the default behavior, configure the
last filter as permit any any .
NOTE
The address filter must already be
configured.
ebgp-btsh enables GTSM protection for the specified neighbor.
ebgp-multihop [num ] specifies that the neighbor is more than one hop away and that the session type with the neighbor is EBGP-
multihop. This option is disabled by default. The num parameter specifies the TTL you are adding for the neighbor. You can specify a
number from 0 through 255. The default is 0. If you leave the EBGP TTL value set to 0, the software uses the IP TTL value.
enforce-first-as ensures, for this neighbor, that the first AS listed in the AS_SEQUENCE field of an AS path update message from
EBGP neighbors is the AS of the neighbor that sent the update.
filter-list in | out num,num,.. specifies an AS-path filter list or a list of AS-path ACLs. The in and out keywords specify whether the list is
applied on updates received from the neighbor or sent to the neighbor. If you specify in or out, the num,num,... parameter specifies the
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FastIron Ethernet Switch Layer 3 Routing
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