Siemens S223, S323 user manual BGP Neighbor, Default Route, Peer Group

User Manual	UMN:CLI
SURPASS hiD 6615 S223/S323 R1.5

10.1.4BGP Neighbor

To assign IP address or peer group name for BGP Neighboring router within specified AS number, use the following command.

Command	Mode	Description
		Configures BGP neighboring router and specify AS
neighbor {NEIGHBOR-IP		number of BGP Neighbor.
		NEIGHBOR-IP: neighbor IP address
WORD} remote-as<1-65535>
	Router	WORD: peer group name or neighbor tag
		1-65535: remote AS Number
no neighbor {NEIGHBOR-IP		Deletes the configured BGP Neighbor within specified
WORD} remote-as<1-65535>		AS number.

10.1.4.1Default Route

The hiD 6615 S323 can be configured that particular neighboring BGP routers or peer group is assigned by default route as 0.0.0.0. Then, neighboring router or member of peer group is able to receive the information of default route from the designated routers.

The following command allows neighboring BGP routers or Peer Group to transmit 0.0.0.0 as the default route.

To generate the default route to BGP neighbor or peer group, use the following command.

Command		Mode	Description
			Generates the default route to BGP Neighbor.
neighbor {NEIGHBOR-IP			NEIGHBOR-IP: neighbor IP address
WORD} default-originate	[route-		WORD: peer group name or neighbor tag
map NAME]		Router	1-65535: remote AS number
			NAME: route map name
no neighbor {NEIGHBOR-IP			Removes the default route for BGP Neighbor or peer
WORD} default-originate	[route-
			group.
map NAME]

10.1.4.2Peer Group

As the number of external BGP group increases, the ability to support a large number of BGP sessions may become a scaling issue. In principle all members of BGP routers within a single AS must connect to other neighboring routers. The preferred way to con- figure a large number of BGP neighbors is to configure a few groups consisting of multi- ple neighbors per group. Supporting fewer BGP groups generally scales better than sup- porting a large number of BGP groups. This becomes more evident in the case of dozens of BGP neighboring groups when compared with a few BGP groups with multiple peers in each group. If the routers belong to same group, they can be applied by same configura- tion. This group is called as Peer Group.

After peer relationships have been established, the BGP peers exchange update mes- sage to advertise network reachability information. You can arrange BGP routers into groups of peers.

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