3Com Switch 7700 Configuration Manual page 174

166 C 5: IP R
HAPTER OUTING
P O
ROTOCOL PERATION
Perform the following configurations in BGP view..
Table 126 Configuring a Sub-AS Belonging to the Confederation
Operation
Configure a confederation consisting of
sub-ASs
Remove the specified sub-AS from the
confederation
By default, no autonomous systems are configured as a member of the
confederation.
Configure the AS Confederation Nonstandard
If it is necessary to perform the interconnection with devices whose BGP
implementation confederation is different from that of RFC1965, you must
configure all the routers in the confederation.
Perform the following configurations in BGP view..
Table 127 Configuring AS Confederation Attribute Compatible with Nonstandard
Operation
Configure AS confederation attribute
compatible with nonstandard router
Cancel AS confederation attribute compatible
with nonstandard router
By default, the configured confederation is consistent with RFC1965.
Defining ACLs, AS Path List, and Route-policy
This section describes the configuration of ACL, AS path list, and Route-policy.
Defining the ACL See "Defining an ACL" on page 234
Defining the AS path list
The routing information packet of BGP includes an AS path domain. The AS
path-list can be used to match the autonomous system path domain of the BGP
routing information to filter the routing information which does not conform to
the requirements. For the same list number, the user can define multiple portions
of the AS path-list, i.e. a list number stands for a group of AS path ACLs. Each AS
path list is identified with a number.
Perform the following configurations in system view: .
Table 128 Defining the AS path list
Operation
Define the AS path list
Delete the specified AS list
By default, no AS path list is defined.
During the matching, the relationship of "OR" is available between the members
(acl-number) of the ACLs, so that when the routing information passes through
Command
confederation peer-as as-number-1 [ ...
as-number-n ]
undo confederation peer-as [ as-number-1 ]
[ ...as-number-n ]
Command
confederation nonstandard
undo confederation nonstandard
Command
ip as-path-acl acl-number { permit | deny }
as-regular-expression
undo ip as-path-acl acl-number