Networklearner: Additive community configuration example

R1:-

interface Loopback0

ip address 1.1.1.1 255.255.255.255

interface FastEthernet2/0

Description “ Connected to R2”

ip address 12.12.12.1 255.255.255.0

no shut

router bgp 1

no synchronization

bgp log-neighbor-changes

network 1.1.1.1 mask 255.255.255.255

neighbor 12.12.12.2 remote-as 2

neighbor 12.12.12.2 send-community both

neighbor 12.12.12.2 route-map setCommunity out \\Setting community value to all R1 Routes\\

no auto-summary

route-map setCommunity permit 10

set community 1:1 11:11 111:111 --<<<Community will attach to routes

ip bgp-community new-format

R2:-

interface Loopback0

ip address 2.2.2.2 255.255.255.255

interface FastEthernet0/0

Description “ Connected to R3”

ip address 23.23.23.2 255.255.255.0

no shut

interface FastEthernet1/0

Description “ Connected to R5”

ip address 25.25.25.2 255.255.255.0

no shut

interface FastEthernet2/0

Description “ Connected to R1”

ip address 12.12.12.2 255.255.255.0

no shut

router eigrp 2

network 23.23.23.2 0.0.0.0

router bgp 2

no synchronization

bgp log-neighbor-changes

network 2.2.2.2 mask 255.255.255.255

neighbor 12.12.12.1 remote-as 1

neighbor 12.12.12.1 route-map set_metric in \\Add 2:2 community to existing list \\

neighbor 23.23.23.3 remote-as 2

neighbor 23.23.23.3 next-hop-self

neighbor 23.23.23.3 send-community both

neighbor 25.25.25.5 remote-as 3

neighbor 25.25.25.5 send-community both

no auto-summary

ip bgp-community new-format

ip community-list standard set_metric_list permit 1:1 \\ Can match any or all community \\

route-map set_metric permit 10

R2(config)#ip community-list ? \\ cannot match community directly, need to create list\\

<1-99> Community list number (standard)

<100-500> Community list number (expanded)

expanded Add an expanded community-list entry

standard Add a standard community-list entry

match community set_metric_list

set community 2:2 additive \\ Add 2:2 to the community set by R1 \\

set metric 500 \\ Optional \\

R3:-

interface Loopback0

ip address 3.3.3.3 255.255.255.255

interface FastEthernet0/0

Description “ Connected to R2”

ip address 23.23.23.3 255.255.255.0

no shut

interface FastEthernet0/1

Description “ Connected to R4”

ip address 34.34.34.3 255.255.255.0

no shut

interface FastEthernet1/0

Description “ Connected to R5”

ip address 25.25.25.2 255.255.255.0

no shut

interface FastEthernet2/0

description "Connected to R1"

ip address 12.12.12.2 255.255.255.0

no shut

router eigrp 2

network 23.23.23.3 0.0.0.0

network 34.34.34.3 0.0.0.0

router bgp 2

no synchronization

bgp log-neighbor-changes

network 3.3.3.3 mask 255.255.255.255

neighbor 23.23.23.2 remote-as 2

neighbor 23.23.23.2 route-reflector-client

neighbor 34.34.34.4 remote-as 2

neighbor 34.34.34.4 route-reflector-client

neighbor 34.34.34.4 send-community both

no auto-summary

ip bgp-community new-format

R4:-

interface Loopback0

ip address 4.4.4.4 255.255.255.255

interface FastEthernet0/1

Description “ Connected to R3”

ip address 34.34.34.4 255.255.255.0

no shut

router eigrp 2

network 34.34.34.4 0.0.0.0

router bgp 2

no synchronization

bgp log-neighbor-changes

network 4.4.4.4 mask 255.255.255.255

neighbor 34.34.34.3 remote-as 2

no auto-summary

ip bgp-community new-format

R5:-

interface Loopback0

ip address 5.5.5.5 255.255.255.255

interface FastEthernet1/0

ip address 25.25.25.5 255.255.255.0

speed auto

duplex auto

router bgp 3

no synchronization

bgp log-neighbor-changes

network 5.5.5.5 mask 255.255.255.255

neighbor 25.25.25.2 remote-as 2

no auto-summary

ip bgp-community new-format

Verification:-

R1# sh ip bgp summary

BGP router identifier 1.1.1.1, local AS number 1

BGP table version is 15, main routing table version 15

5 network entries using 640 bytes of memory

5 path entries using 260 bytes of memory

4/4 BGP path/bestpath attribute entries using 496 bytes of memory

2 BGP AS-PATH entries using 48 bytes of memory

0 BGP route-map cache entries using 0 bytes of memory

0 BGP filter-list cache entries using 0 bytes of memory

BGP using 1444 total bytes of memory

BGP activity 6/1 prefixes, 9/4 paths, scan interval 60 secs

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd

12.12.12.2 4 2 105 102 15 0 0 01:27:17 4 \\R2 neighborship\\

R1#sh ip bgp

BGP table version is 15, local router ID is 1.1.1.1

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale, m multipath, b backup-path, x best-external

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path

*> 1.1.1.1/32 0.0.0.0 0 32768 i

*> 2.2.2.2/32 12.12.12.2 0 0 2 i

*> 3.3.3.3/32 12.12.12.2 0 2 i

*> 4.4.4.4/32 12.12.12.2 0 2 i

*> 5.5.5.5/32 12.12.12.2 0 2 3 i

R1#sh ip bgp 1.1.1.1/32

BGP routing table entry for 1.1.1.1/32, version 3

Paths: (1 available, best #1, table default)

Advertised to update-groups:

Local

0.0.0.0 from 0.0.0.0 (1.1.1.1)

Origin IGP, metric 0, localpref 100, weight 32768, valid, sourced, local, best

R1#sh ip route

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route, H - NHRP

+ - replicated route, % - next hop override

Gateway of last resort is not set

1.0.0.0/32 is subnetted, 1 subnets

C 1.1.1.1 is directly connected, Loopback0

2.0.0.0/32 is subnetted, 1 subnets

B 2.2.2.2 [20/0] via 12.12.12.2, 01:26:54

3.0.0.0/32 is subnetted, 1 subnets

B 3.3.3.3 [20/0] via 12.12.12.2, 01:27:25

4.0.0.0/32 is subnetted, 1 subnets

B 4.4.4.4 [20/0] via 12.12.12.2, 01:27:25

5.0.0.0/32 is subnetted, 1 subnets

B 5.5.5.5 [20/0] via 12.12.12.2, 01:27:25

12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 12.12.12.0/24 is directly connected, FastEthernet2/0

L 12.12.12.1/32 is directly connected, FastEthernet2/0

R1#

R2:-

R2#sh ip route

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route, H - NHRP

+ - replicated route, % - next hop override

Gateway of last resort is not set

1.0.0.0/32 is subnetted, 1 subnets

B 1.1.1.1 [20/500] via 12.12.12.1, 01:27:20

2.0.0.0/32 is subnetted, 1 subnets

C 2.2.2.2 is directly connected, Loopback0

3.0.0.0/32 is subnetted, 1 subnets

B 3.3.3.3 [200/0] via 23.23.23.3, 01:29:33

4.0.0.0/32 is subnetted, 1 subnets

B 4.4.4.4 [200/0] via 34.34.34.4, 01:29:33

5.0.0.0/32 is subnetted, 1 subnets

B 5.5.5.5 [20/0] via 25.25.25.5, 01:29:33

12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 12.12.12.0/24 is directly connected, FastEthernet2/0

L 12.12.12.2/32 is directly connected, FastEthernet2/0

23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 23.23.23.0/24 is directly connected, FastEthernet0/0

L 23.23.23.2/32 is directly connected, FastEthernet0/0

25.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 25.25.25.0/24 is directly connected, FastEthernet1/0

L 25.25.25.2/32 is directly connected, FastEthernet1/0

34.0.0.0/24 is subnetted, 1 subnets

D 34.34.34.0 [90/30720] via 23.23.23.3, 04:12:43, FastEthernet0/0

R2#sh ip bgp summary

BGP router identifier 2.2.2.2, local AS number 2

BGP table version is 7, main routing table version 7

5 network entries using 640 bytes of memory

5 path entries using 260 bytes of memory

5/4 BGP path/bestpath attribute entries using 620 bytes of memory

1 BGP rrinfo entries using 24 bytes of memory

2 BGP AS-PATH entries using 48 bytes of memory

1 BGP community entries using 24 bytes of memory

0 BGP route-map cache entries using 0 bytes of memory

0 BGP filter-list cache entries using 0 bytes of memory

BGP using 1616 total bytes of memory

BGP activity 10/5 prefixes, 10/5 paths, scan interval 60 secs

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd

12.12.12.1 4 1 105 107 7 0 0 01:29:37 1

23.23.23.3 4 2 105 108 7 0 0 01:29:37 2

25.25.25.5 4 3 104 106 7 0 0 01:29:37 1

R2#sh ip bgp

BGP table version is 7, local router ID is 2.2.2.2

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale, m multipath, b backup-path, x best-external

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path

*> 1.1.1.1/32 12.12.12.1 500 0 1 i

*> 2.2.2.2/32 0.0.0.0 0 32768 i

*>i3.3.3.3/32 23.23.23.3 0 100 0 i

*>i4.4.4.4/32 34.34.34.4 0 100 0 i

*> 5.5.5.5/32 25.25.25.5 0 0 3 i

R2# sh ip bgp 1.1.1.1/32

BGP routing table entry for 1.1.1.1/32, version 8

Paths: (1 available, best #1, table default)

Advertised to update-groups:

5 6

12.12.12.1 from 12.12.12.1 (1.1.1.1)

Origin IGP, metric 500, localpref 100, valid, external, best

Community: 1:1 2:2 11:11 111:111 \\ R2 Community + Community set on R1 \\

R3:-

R3# sh ip bgp

BGP table version is 13, local router ID is 3.3.3.3

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale, m multipath, b backup-path, x best-external

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path

*>i1.1.1.1/32 23.23.23.2 500 100 0 1 i

*>i2.2.2.2/32 23.23.23.2 0 100 0 i

*> 3.3.3.3/32 0.0.0.0 0 32768 i

*>i4.4.4.4/32 34.34.34.4 0 100 0 i

*>i5.5.5.5/32 23.23.23.2 0 100 0 3 i

R3# sh ip bgp summ

BGP router identifier 3.3.3.3, local AS number 2

BGP table version is 13, main routing table version 13

5 network entries using 640 bytes of memory

5 path entries using 260 bytes of memory

4/4 BGP path/bestpath attribute entries using 496 bytes of memory

2 BGP AS-PATH entries using 48 bytes of memory

1 BGP community entries using 24 bytes of memory

0 BGP route-map cache entries using 0 bytes of memory

0 BGP filter-list cache entries using 0 bytes of memory

BGP using 1468 total bytes of memory

BGP activity 6/1 prefixes, 8/3 paths, scan interval 60 secs

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd

23.23.23.2 4 2 110 107 13 0 0 01:31:28 3

34.34.34.4 4 2 283 289 13 0 0 04:13:45 1

R3#sh ip route

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route, H - NHRP

+ - replicated route, % - next hop override

Gateway of last resort is not set

1.0.0.0/32 is subnetted, 1 subnets

B 1.1.1.1 [200/500] via 23.23.23.2, 01:29:17

2.0.0.0/32 is subnetted, 1 subnets

B 2.2.2.2 [200/0] via 23.23.23.2, 01:31:25

3.0.0.0/32 is subnetted, 1 subnets

C 3.3.3.3 is directly connected, Loopback0

4.0.0.0/32 is subnetted, 1 subnets

B 4.4.4.4 [200/0] via 34.34.34.4, 04:12:52

5.0.0.0/32 is subnetted, 1 subnets

B 5.5.5.5 [200/0] via 23.23.23.2, 01:31:30

12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 12.12.12.0/24 is directly connected, FastEthernet2/0

L 12.12.12.2/32 is directly connected, FastEthernet2/0

23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 23.23.23.0/24 is directly connected, FastEthernet0/0

L 23.23.23.3/32 is directly connected, FastEthernet0/0

25.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 25.25.25.0/24 is directly connected, FastEthernet1/0

L 25.25.25.2/32 is directly connected, FastEthernet1/0

34.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 34.34.34.0/24 is directly connected, FastEthernet0/1

L 34.34.34.3/32 is directly connected, FastEthernet0/1

R3#sh ip bgp 1.1.1.1

BGP routing table entry for 1.1.1.1/32, version 2

Paths: (1 available, best #1, table default)

Advertised to update-groups:

1, (Received from a RR-client)

23.23.23.2 from 23.23.23.2 (2.2.2.2)

Origin IGP, metric 500, localpref 100, valid, internal, best

Community: 1:1 2:2 11:11 111:111 \\ R2 Community i.e. 2:2 + Community set on R1 \\

R4:-

R4# sh ip bgp summary

BGP router identifier 4.4.4.4, local AS number 2

BGP table version is 13, main routing table version 13

5 network entries using 640 bytes of memory

5 path entries using 260 bytes of memory

4/4 BGP path/bestpath attribute entries using 496 bytes of memory

1 BGP rrinfo entries using 24 bytes of memory

2 BGP AS-PATH entries using 48 bytes of memory

1 BGP community entries using 24 bytes of memory

0 BGP route-map cache entries using 0 bytes of memory

0 BGP filter-list cache entries using 0 bytes of memory

BGP using 1492 total bytes of memory

BGP activity 6/1 prefixes, 8/3 paths, scan interval 60 secs

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd

34.34.34.3 4 2 290 284 13 0 0 04:14:07 4

R4#sh ip route

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route, H - NHRP

+ - replicated route, % - next hop override

Gateway of last resort is not set

1.0.0.0/32 is subnetted, 1 subnets

B 1.1.1.1 [200/500] via 23.23.23.2, 01:30:38

2.0.0.0/32 is subnetted, 1 subnets

B 2.2.2.2 [200/0] via 23.23.23.2, 01:32:46

3.0.0.0/32 is subnetted, 1 subnets

B 3.3.3.3 [200/0] via 34.34.34.3, 04:13:14

4.0.0.0/32 is subnetted, 1 subnets

C 4.4.4.4 is directly connected, Loopback0

5.0.0.0/32 is subnetted, 1 subnets

B 5.5.5.5 [200/0] via 23.23.23.2, 01:32:51

23.0.0.0/24 is subnetted, 1 subnets

D 23.23.23.0 [90/30720] via 34.34.34.3, 04:14:15, FastEthernet0/1

34.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 34.34.34.0/24 is directly connected, FastEthernet0/1

L 34.34.34.4/32 is directly connected, FastEthernet0/1

45.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 45.45.45.0/24 is directly connected, FastEthernet2/0

L 45.45.45.4/32 is directly connected, FastEthernet2/0

R4#sh ip bgp

BGP table version is 13, local router ID is 4.4.4.4

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale, m multipath, b backup-path, x best-external

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path

*>i1.1.1.1/32 23.23.23.2 500 100 0 1 i

*>i2.2.2.2/32 23.23.23.2 0 100 0 i

*>i3.3.3.3/32 34.34.34.3 0 100 0 i

*> 4.4.4.4/32 0.0.0.0 0 32768 i

*>i5.5.5.5/32 23.23.23.2 0 100 0 3 i

R4#sh ip bgp 1.1.1.1/32

BGP routing table entry for 1.1.1.1/32, version 19

Paths: (1 available, best #1, table default)

Not advertised to any peer

23.23.23.2 (metric 30720) from 34.34.34.3 (3.3.3.3)

Origin IGP, metric 500, localpref 100, valid, internal, best

Community: 1:1 2:2 11:11 111:111

Originator: 2.2.2.2, Cluster list: 3.3.3.3 \\ R2 Community + Community set on R1 \\

R5:-

R5# sh ip route

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP

D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

E1 - OSPF external type 1, E2 - OSPF external type 2

i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

ia - IS-IS inter area, * - candidate default, U - per-user static route

o - ODR, P - periodic downloaded static route, H - NHRP

+ - replicated route, % - next hop override

Gateway of last resort is not set

1.0.0.0/32 is subnetted, 1 subnets

B 1.1.1.1 [20/0] via 25.25.25.2, 01:34:00

2.0.0.0/32 is subnetted, 1 subnets

B 2.2.2.2 [20/0] via 25.25.25.2, 01:33:29

3.0.0.0/32 is subnetted, 1 subnets

B 3.3.3.3 [20/0] via 25.25.25.2, 01:34:00

4.0.0.0/32 is subnetted, 1 subnets

B 4.4.4.4 [20/0] via 25.25.25.2, 01:34:00

5.0.0.0/32 is subnetted, 1 subnets

C 5.5.5.5 is directly connected, Loopback0

25.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 25.25.25.0/24 is directly connected, FastEthernet1/0

L 25.25.25.5/32 is directly connected, FastEthernet1/0

R5# sh ip bgp summary

BGP router identifier 5.5.5.5, local AS number 3

BGP table version is 14, main routing table version 14

5 network entries using 640 bytes of memory

5 path entries using 260 bytes of memory

4/4 BGP path/bestpath attribute entries using 496 bytes of memory

2 BGP AS-PATH entries using 48 bytes of memory

0 BGP route-map cache entries using 0 bytes of memory

0 BGP filter-list cache entries using 0 bytes of memory

BGP using 1444 total bytes of memory

BGP activity 6/1 prefixes, 9/4 paths, scan interval 60 secs

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd

25.25.25.2 4 2 111 109 14 0 0 01:34:04 4

R5#sh ip bgp

BGP table version is 14, local router ID is 5.5.5.5

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale, m multipath, b backup-path, x best-external

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path

*> 1.1.1.1/32 25.25.25.2 0 2 1 i

*> 2.2.2.2/32 25.25.25.2 0 0 2 i

*> 3.3.3.3/32 25.25.25.2 0 2 i

*> 4.4.4.4/32 25.25.25.2 0 2 i

*> 5.5.5.5/32 0.0.0.0 0 32768 i

R5#sh ip bgp 1.1.1.1/32

BGP routing table entry for 1.1.1.1/32, version 16

Paths: (1 available, best #1, table default)

Not advertised to any peer

2 1

25.25.25.2 from 25.25.25.2 (2.2.2.2)

Origin IGP, localpref 100, valid, external, best

Community: 1:1 2:2 11:11 111:111 \\ R2 Community + Community set on R1 \\

Networklearner

Tuesday, 18 April 2017

Additive community configuration example - BGP

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