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Examples: Enabling BGP

Enable BGP and define an EBGP group that recognizes all BGP systems in AS 56 as peers:

[edit]
routing-options {
autonomous-system 23;
}
protocols {
bgp {
group 23 {
type external;
peer-as 56;
0.0.0.0/0;
}
}
}

Enable BGP and define an IBGP group that recognizes only the specified addresses as BGP peers.

[edit]
routing-options {
autonomous-system 23;
router-id 10.0.0.1;
}
protocols {
bgp {
group 23 {
type internal;
peer-as 23;
neighbor 10.0.0.2;
neighbor 10.0.0.3;
}
}
}

Configure a BGP confederation. Figure 9 illustrates the confederation topology used in this example. For AS 32 to be a valid confederation, all routers in the AS must be members of the confederation. For example, Router B must have a confederation member AS number as well as a confederation AS number. Within a confederation, the links between the confederation member ASs must be EBGP links, not IBGP links.

Figure 9: Example: BGP Confederation Topology

Image g017006.gif

On Router A:
[edit]
routing-options {
autonomous-system 5;
}
protocols {
bgp {
group AtoB {
type external;
peer-as 32;
neighbor 10.0.0.2;
}
}
}
On Router B:
[edit]
routing-options {
autonomous-system 65500;
confederation 32 members [ 65500 65501 65502 ];
}
protocols {
bgp {
group BtoA {
type external;
peer-as 5;
neighbor 10.0.0.1;
}
group BtoD {
type external;
peer-as 65501;
neighbor 10.0.10.2;
}
}
}
On Router C:
[edit]
routing-options {
autonomous-system 65501;
confederation 32 members [ 65500 65501 65502 ];
}
protocols {
bgp {
group CtoD {
type internal;
neighbor 10.0.10.3;
}
}
}
On Router D:
[edit]
routing-options {
autonomous-system 65501;
confederation 32 members [ 65500 65501 65502 ];
}
protocols {
bgp {
group DtoC {
type internal;
neighbor 10.0.10.1;
}
group DtoB {
type external;
peer-as 65500;
neighbor 10.0.10.1;
}
group DtoE {
type external;
peer-as 65502;
neighbor 10.0.30.1;
}
}
}
On Router E:
[edit]
routing-options {
autonomous-system 65502;
confederation 32 members [ 65500 65501 65502 ];
}
protocols {
bgp {
group EtoD {
type external;
peer-as 65501;
neighbor 10.0.10.4;
}
group EtoFandG {
type internal;
neighbor 10.0.30.2;
neighbor 10.0.30.5;
}
}
}
On Router F:
[edit]
routing-options {
autonomous-system 65502;
confederation 32 members [ 65500 65501 65502 ];
}
protocols {
bgp {
group FtoEandG {
type internal;
neighbor 10.0.30.3;
neighbor 10.0.30.7;
}
}
}
On Router G:
[edit]
routing-options {
autonomous-system 65502;
confederation 32 members [ 65500 65501 65502 ];
}
protocols {
bgp {
group GtoH {
type external;
peer-as 37;
neighbor 10.0.40.1;
}
group GtoEandF {
type internal;
neighbor 10.0.30.4;
neighbor 10.0.30.5;
}
}
}
On Router H:
[edit]
routing-options {
autonomous-system 37;
}
protocols {
bgp {
group HtoG {
type external;
peer-as 32;
neighbor 10.0.30.8;
}
}
}
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