BGP Cluster-list (Lab)

r1:loopback 1(11.11.11.11)
r2:loopback 1(22.22.22.22)
r3:loopback 1(33.33.33.33)
r4:loopback 1(44.44.44.44)
r5:loopback 1(55.55.55.55)
r6:loopback 1(66.66.66.66)
通过network通告到bgp

ps：bgp默认会使用router-id作为自己的Cluster-ID

r6#sh ip b
BGP table version is 7, local router ID is 6.6.6.6
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*>i11.11.11.11/32   1.1.1.1                  0    100      0 ?
*>i22.22.22.22/32   2.2.2.2                  0    100      0 ?
*>i33.33.33.33/32   3.3.3.3                  0    100      0 ?
*>i44.44.44.44/32   4.4.4.4                  0    100      0 ?
*>i55.55.55.55/32   5.5.5.5                  0    100      0 ?
*> 66.66.66.66/32   0.0.0.0                  0         32768 ?

r6#sh ip b 44.44.44.44
BGP routing table entry for 44.44.44.44/32, version 5
Paths: (1 available, best #1, table Default-IP-Routing-Table)
  Not advertised to any peer
  Local
    4.4.4.4 (metric 129) from 3.3.3.3 (3.3.3.3)
      Origin incomplete, metric 0, localpref 100, valid, internal, best
      Originator: 4.4.4.4, Cluster list: 3.3.3.3, 2.2.2.2, 1.1.1.1

通过client收到的路由会加入自己的Cluster-ID

r6#sh ip b 11.11.11.11
BGP routing table entry for 11.11.11.11/32, version 2
Paths: (1 available, best #1, table Default-IP-Routing-Table)
  Not advertised to any peer
  Local
    1.1.1.1 (metric 321) from 3.3.3.3 (3.3.3.3)
      Origin incomplete, metric 0, localpref 100, valid, internal, best
      Originator: 1.1.1.1, Cluster list: 3.3.3.3, 2.2.2.2

RR上通告的路由不会加入自己的Cluster-ID

在R3上手动修改Cluster-ID为2.2.2.2
r3#sh ip b
BGP table version is 4, local router ID is 3.3.3.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*>i22.22.22.22/32   2.2.2.2                  0    100      0 ?
*> 33.33.33.33/32   0.0.0.0                  0         32768 ?
*>i66.66.66.66/32   6.6.6.6                  0    100      0 ?

在接收路由的时候在Cluster list里看到带有自己的Cluster-ID，而不接收这条路由。

r6#sh ip b
BGP table version is 24, local router ID is 6.6.6.6
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*>i22.22.22.22/32   2.2.2.2                  0    100      0 ?
*>i33.33.33.33/32   3.3.3.3                  0    100      0 ?
*> 66.66.66.66/32   0.0.0.0                  0         32768 ?