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 --<<<Communities 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 Community_filter in \\Match
R1 community and remove 1:1 \\
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
route-map Community_filter permit 10
set comm-list Filter_1:1
delete \\
remove communities which are in community list \\
ip bgp-community new-format
ip community-list standard Filter_1:1 permit 1:1 \\ Match community 1:1 \\
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:
2
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 2
Paths: (1 available, best #1, table default)
Advertised to
update-groups:
8 9
1
12.12.12.1 from
12.12.12.1 (1.1.1.1)
Origin IGP,
metric 0, localpref 100, valid, external, best
Community:
11:11 111:111 \\ Removed 1:1 from the list \\
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 1.1.1.1/32
BGP routing table entry for 1.1.1.1/32, version 11
Paths: (1 available, best #1, table default)
Advertised to
update-groups:
4
1, (Received from
a RR-client)
23.23.23.2 from
23.23.23.2 (2.2.2.2)
Origin IGP,
metric 0, localpref 100, valid, internal, best
Community:
11:11 111:111 \\ 1:1 community is not received from R2 \\
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 27
Paths: (1 available, best #1, table default)
Not advertised to
any peer
1
23.23.23.2
(metric 30720) from 34.34.34.3 (3.3.3.3)
Origin IGP,
metric 0, localpref 100, valid, internal, best
Community:
11:11 111:111
Originator:
2.2.2.2, Cluster list: 3.3.3.3 \\ 1:1 community is not received from R2 \\
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 22
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:
11:11 111:111 \\ 1:1 community is not received from R2 \\
