BGP Confederations
In this section, we’ll talk about the BGP Confederation. You
might know, IBGP requires a full mesh of peering which can become administrative overhead. If you don’t know why we need a full mesh, I advise taking a look BGP peers first.
IBGP full mash issues
- With iBGP, every router in the BGP autonomous system must fully mesh.
- A large number of TCP sessions
- Unnecessary duplicate of routing traffic
- Manual configuration
Solution
1.Route reflector
2.BGP confederations
A
BGP confederation divides AS into sub-ASes to reduce the number of required
IBGP peering's. in other words, BGP Confederations Feature is used to split an autonomous system into smaller
autonomous systems.
Confederations are usable only for huge autonomous systems
where you can afford to split them into several sub-ASes. Each sub-as in a confederation needs to have its internal
iBGP peers either fully meshed or use a route reflector internally. The confederations are not much of an advantage for small
ASes having a few BGP routers.
Before we start BGP configuration check out some important of BGP CCIE exam topics.
1.Introduction of BGP
2.BGP Neighbors
3.BGP Peer Group
4.BGP Attributes
5.BGP Weight Attribute
6.BGP Local Preference (Local_Pref)
7.BGP Multi Exit Discriminator (MED)
8.BGP AS Path Prepending
9.BGP Route Reflectors (RR)
10.BGP Communities_No-advertise configuration
11.BGP community Local-AS
12.BGP Confederations and configuration
13.BGP Route filtering methods
- configure the topology as per the diagram and assign the IP addresses.
- configure iBGP and EBGP configuration.
- configure BGP peerings using BGP Confederations.
R1#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 10.1.1.1 YES manual up up
Serial3/0 1.1.1.1 YES manual up up
Serial3/5 6.1.1.2 YES manual up up
Loopback0 11.0.0.1 YES manual up up
R2#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 20.1.1.1 YES manual up up
Serial3/0 1.1.1.2 YES manual up up
Serial3/1 2.1.1.1 YES manual up up
Loopback0 12.0.0.1 YES manual up up
R3#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 30.1.1.1 YES manual up down
Serial3/1 2.1.1.2 YES manual up up
Serial3/2 3.1.1.1 YES manual up up
Loopback0 13.0.0.1 YES manual up up
R4#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 40.1.1.1 YES manual up up
Serial3/2 3.1.1.2 YES manual up up
Serial3/3 4.1.1.1 YES manual up up
Loopback0 14.0.0.1 YES manual up up
R5#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 50.1.1.1 YES manual up up
Serial3/3 4.1.1.2 YES manual up up
Serial3/4 5.1.1.1 YES manual up up
Loopback0 15.0.0.1 YES manual up up
R6#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 30.1.1.2 YES manual up up
Serial3/4 5.1.1.2 YES manual up up
Serial3/5 6.1.1.1 YES manual up up
Loopback0 16.0.0.1 YES manual up up
R1(config)#router bgp
650012
R1(config-router)#neighbor
6.1.1.1 remote-as 650006
R1(config-router)#neighbor
1.1.1.2 remote-as 650012
R1(config-router)#network
10.0.0.0
R1(config-router)#network
1.0.0.0
R1(config-router)#network
6.0.0.0
R1(config-router)#network
11.0.0.0 mask 255.255.255.0
R1(config-router)#no
auto-summary
R1(config-router)#no
synchronization
R1(config-router)#exit
R2(config)#router bgp
650012
R2(config-router)#neighbor
1.1.1.1 remote-as 650012
R2(config-router)#neighbor
2.1.1.2 remote-as 650345
R2(config-router)#network
1.0.0.0
R2(config-router)#network
2.0.0.0
R2(config-router)#network
20.0.0.0
R2(config-router)#network
12.0.0.0 mask 255.255.255.0
R2(config-router)#no
auto-summary
R2(config-router)#no
synchronization
R2(config-router)#exit
R3(config)#router bgp
650034
R3(config-router)#bgp
confederation identifier 650345
R3(config-router)#neighbor
2.1.1.1 remote-as 650012
R3(config-router)#neighbor
3.1.1.2 remote-as 650034
R3(config-router)#network
30.0.0.0
R3(config-router)#network
3.0.0.0
R3(config-router)#network
2.0.0.0
R3(config-router)#network
13.0.0.0 mask 255.255.255.0
R3(config-router)#no
auto-summary
R3(config-router)#no
synchronization
R3(config-router)#exit
R4(config)#router bgp
650034
R4(config-router)#bgp
confederation identifier 650345
R4(config-router)#bgp
confederation peers 650005
R4(config-router)#neighbor
3.1.1.1 remote-as 650034
R4(config-router)#neighbor
4.1.1.2 remote-as 650005
R4(config-router)#network
40.0.0.0
R4(config-router)#network
4.0.0.0
R4(config-router)#network
3.0.0.0
R4(config-router)#network
14.0.0.0 mask 255.255.255.0
R4(config-router)#no
synchronization
R4(config-router)#no
auto-summary
R4(config-router)#exit
R5(config-if)#router
bgp 650005
R5(config-router)#bgp
confederation identifier 650345
R5(config-router)#bgp
confederation peers 650034
R5(config-router)#neighbor
4.1.1.1 remote-as 650034
R5(config-router)#neighbor
5.1.1.2 remote-as 650006
R5(config-router)#network
50.0.0.0
R5(config-router)#network
5.0.0.0
R5(config-router)#network
4.0.0.0
R5(config-router)#network
15.0.0.0 mask 255.255.255.0
R5(config-router)#no
auto-summary
R5(config-router)#no
synchronization
R5(config-router)#exit
R6(config-if)#router
bgp 650006
R6(config-router)#neighbor
5.1.1.1 remote-as 650345
R6(config-router)#neighbor
6.1.1.2 remote-as 650012
R6(config-router)#network
6.0.0.0
R6(config-router)#network
5.0.0.0
R6(config-router)#network
60.0.0.0
R6(config-router)#network
16.0.0.0 mask 255.255.255.0
R6(config-router)#no
synchronization
R6(config-router)#no
auto-summary
R6(config-router)#exit
R1#show ip bgp summary
BGP router identifier 11.0.0.1, local AS number 650012
BGP table version is 27, main routing table version 27
16 network entries using 2304 bytes of memory
26 path entries using 2080 bytes of memory
5/4 BGP path/bestpath attribute entries using 680 bytes of memory
3 BGP AS-PATH entries using 72 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 5136 total bytes of memory
BGP activity 21/5 prefixes, 31/5 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
1.1.1.2 4 650012 94 87 27 0 0 01:13:02 12
6.1.1.1 4 650006 31 31 27 0 0 00:21:31 10
R1#show ip bgp
BGP table version is 27, local router ID is 11.0.0.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
* i 1.0.0.0 1.1.1.2 0 100 0 i
*> 0.0.0.0 0 32768 i
*>i 2.0.0.0 1.1.1.2 0 100 0 i
* 3.0.0.0 6.1.1.1 0 650006 650345 i
*>i 2.1.1.2 0 100 0 650345 i
* 4.0.0.0 6.1.1.1 0 650006 650345 i
*>i 2.1.1.2 0 100 0 650345 i
* i 5.0.0.0 2.1.1.2 0 100 0 650345 i
*> 6.1.1.1 0 0 650006 i
* 6.0.0.0 6.1.1.1 0 0 650006 i
*> 0.0.0.0 0 32768 i
*> 10.0.0.0 0.0.0.0 0 32768 i
*> 11.0.0.0/24 0.0.0.0 0 32768 i
*>i 12.0.0.0/24 1.1.1.2 0 100 0 i
Network Next Hop Metric LocPrf Weight Path
* 13.0.0.0/24 6.1.1.1 0 650006 650345 i
*>i 2.1.1.2 0 100 0 650345 i
* 14.0.0.0/24 6.1.1.1 0 650006 650345 i
*>i 2.1.1.2 0 100 0 650345 i
* 15.0.0.0/24 6.1.1.1 0 650006 650345 i
*>i 2.1.1.2 0 100 0 650345 i
*> 16.0.0.0/24 6.1.1.1 0 0 650006 i
*>i 20.0.0.0 1.1.1.2 0 100 0 i
* 40.0.0.0 6.1.1.1 0 650006 650345 i
*>i 2.1.1.2 0 100 0 650345 i
* 50.0.0.0 6.1.1.1 0 650006 650345 i
*>i 2.1.1.2 0 100 0 650345 i
R1#show ip route bgp
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, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
B 2.0.0.0/8 [200/0] via 1.1.1.2, 00:05:53
B 3.0.0.0/8 [200/0] via 2.1.1.2, 00:05:53
B 4.0.0.0/8 [200/0] via 2.1.1.2, 00:05:53
B 5.0.0.0/8 [20/0] via 6.1.1.1, 00:05:53
12.0.0.0/24 is subnetted, 1 subnets
B 12.0.0.0 [200/0] via 1.1.1.2, 00:05:53
13.0.0.0/24 is subnetted, 1 subnets
B 13.0.0.0 [200/0] via 2.1.1.2, 00:05:53
14.0.0.0/24 is subnetted, 1 subnets
B 14.0.0.0 [200/0] via 2.1.1.2, 00:05:53
15.0.0.0/24 is subnetted, 1 subnets
B 15.0.0.0 [200/0] via 2.1.1.2, 00:05:53
16.0.0.0/24 is subnetted, 1 subnets
B 16.0.0.0 [20/0] via 6.1.1.1, 00:05:53
B 20.0.0.0/8 [200/0] via 1.1.1.2, 00:05:53
B 40.0.0.0/8 [200/0] via 2.1.1.2, 00:05:53
B 50.0.0.0/8 [200/0] via 2.1.1.2, 00:05:53
R2#show ip bgp summary
BGP router identifier 12.0.0.1, local AS number 650012
BGP table version is 29, main routing table version 29
16 network entries using 2304 bytes of memory
20 path entries using 1600 bytes of memory
6/5 BGP path/bestpath attribute entries using 816 bytes of memory
3 BGP AS-PATH entries using 72 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 4792 total bytes of memory
BGP activity 21/5 prefixes, 26/6 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
1.1.1.1 4 650012 93 99 29 0 0 01:17:42 6
2.1.1.2 4 650345 66 64 29 0 0 00:52:03 10
R2#show ip bgp
BGP table version is 29, local router ID is 12.0.0.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 1.0.0.0 0.0.0.0 0 32768 i
* i 1.1.1.1 0 100 0 i
* 2.0.0.0 2.1.1.2 0 0 650345 i
*> 0.0.0.0 0 32768 i
*> 3.0.0.0 2.1.1.2 0 0 650345 i
*> 4.0.0.0 2.1.1.2 0 650345 i
*> 5.0.0.0 2.1.1.2 0 650345 i
* i 6.1.1.1 0 100 0 650006 i
*>i 6.0.0.0 1.1.1.1 0 100 0 i
*>i 10.0.0.0 1.1.1.1 0 100 0 i
*>i 11.0.0.0/24 1.1.1.1 0 100 0 i
*> 12.0.0.0/24 0.0.0.0 0 32768 i
*> 13.0.0.0/24 2.1.1.2 0 0 650345 i
*> 14.0.0.0/24 2.1.1.2 0 650345 i
Network Next Hop Metric LocPrf Weight Path
*> 15.0.0.0/24 2.1.1.2 0 650345 i
* 16.0.0.0/24 2.1.1.2 0 650345 650006 i
*>i 6.1.1.1 0 100 0 650006 i
*> 20.0.0.0 0.0.0.0 0 32768 i
*> 40.0.0.0 2.1.1.2 0 650345 i
*> 50.0.0.0 2.1.1.2 0 650345 i
R2#show ip route bgp
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, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
B 3.0.0.0/8 [20/0] via 2.1.1.2, 00:51:53
B 4.0.0.0/8 [20/0] via 2.1.1.2, 00:25:12
B 5.0.0.0/8 [20/0] via 2.1.1.2, 00:23:17
B 6.0.0.0/8 [200/0] via 1.1.1.1, 00:26:36
B 10.0.0.0/8 [200/0] via 1.1.1.1, 01:18:02
11.0.0.0/24 is subnetted, 1 subnets
B 11.0.0.0 [200/0] via 1.1.1.1, 01:18:02
13.0.0.0/24 is subnetted, 1 subnets
B 13.0.0.0 [20/0] via 2.1.1.2, 00:51:53
14.0.0.0/24 is subnetted, 1 subnets
B 14.0.0.0 [20/0] via 2.1.1.2, 00:49:06
15.0.0.0/24 is subnetted, 1 subnets
B 15.0.0.0 [20/0] via 2.1.1.2, 00:24:42
16.0.0.0/24 is subnetted, 1 subnets
B 16.0.0.0 [200/0] via 6.1.1.1, 00:26:32
B 40.0.0.0/8 [20/0] via 2.1.1.2, 00:49:35
B 50.0.0.0/8 [20/0] via 2.1.1.2, 00:24:42
R3#show ip bgp summary
BGP router identifier 13.0.0.1, local AS number 650034
BGP table version is 36, main routing table version 36
16 network entries using 2304 bytes of memory
19 path entries using 1520 bytes of memory
7/6 BGP path/bestpath attribute entries using 952 bytes of memory
4 BGP AS-PATH entries using 96 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 4872 total bytes of memory
BGP activity 18/2 prefixes, 28/9 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
2.1.1.1 4 650012 67 68 36 0 0 00:54:26 8
3.1.1.2 4 650034 68 68 36 0 0 00:52:06 8
R3#show ip bgp
BGP table version is 36, local router ID is 13.0.0.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*> 1.0.0.0 2.1.1.1 0 0 650012 i
*> 2.0.0.0 0.0.0.0 0 32768 i
* 2.1.1.1 0 0 650012 i
* i 3.0.0.0 3.1.1.2 0 100 0 i
*> 0.0.0.0 0 32768 i
*>i 4.0.0.0 3.1.1.2 0 100 0 i
*>i 5.0.0.0 4.1.1.2 0 100 0 (650005) i
*> 6.0.0.0 2.1.1.1 0 650012 i
*> 10.0.0.0 2.1.1.1 0 650012 i
*> 11.0.0.0/24 2.1.1.1 0 650012 i
*> 12.0.0.0/24 2.1.1.1 0 0 650012 i
*> 13.0.0.0/24 0.0.0.0 0 32768 i
*>i 14.0.0.0/24 3.1.1.2 0 100 0 i
*>i 15.0.0.0/24 4.1.1.2 0 100 0 (650005) i
Network Next Hop Metric LocPrf Weight Path
*>i 16.0.0.0/24 5.1.1.2 0 100 0 (650005) 650006 i
* 2.1.1.1 0 650012 650006 i
*> 20.0.0.0 2.1.1.1 0 0 650012 i
*>i 40.0.0.0 3.1.1.2 0 100 0 i
*>i 50.0.0.0 4.1.1.2 0 100 0 (650005) i
R3#show ip route bgp
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, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
B 1.0.0.0/8 [20/0] via 2.1.1.1, 00:12:49
B 4.0.0.0/8 [200/0] via 3.1.1.2, 00:12:49
B 5.0.0.0/8 [200/0] via 4.1.1.2, 00:12:49
B 6.0.0.0/8 [20/0] via 2.1.1.1, 00:12:49
B 10.0.0.0/8 [20/0] via 2.1.1.1, 00:12:49
11.0.0.0/24 is subnetted, 1 subnets
B 11.0.0.0 [20/0] via 2.1.1.1, 00:12:49
12.0.0.0/24 is subnetted, 1 subnets
B 12.0.0.0 [20/0] via 2.1.1.1, 00:12:49
14.0.0.0/24 is subnetted, 1 subnets
B 14.0.0.0 [200/0] via 3.1.1.2, 00:12:49
15.0.0.0/24 is subnetted, 1 subnets
B 15.0.0.0 [200/0] via 4.1.1.2, 00:12:49
16.0.0.0/24 is subnetted, 1 subnets
B 16.0.0.0 [200/0] via 5.1.1.2, 00:12:49
B 20.0.0.0/8 [20/0] via 2.1.1.1, 00:12:49
B 40.0.0.0/8 [200/0] via 3.1.1.2, 00:12:49
B 50.0.0.0/8 [200/0] via 4.1.1.2, 00:12:49
R4#show ip bgp summary
BGP router identifier 14.0.0.1, local AS number 650034
BGP table version is 24, main routing table version 24
16 network entries using 2304 bytes of memory
19 path entries using 1520 bytes of memory
5/5 BGP path/bestpath attribute entries using 680 bytes of memory
3 BGP AS-PATH entries using 72 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 4576 total bytes of memory
BGP activity 18/2 prefixes, 23/4 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
3.1.1.1 4 650034 70 70 24 0 0 00:54:01 9
4.1.1.2 4 650005 38 41 24 0 0 00:29:05 6
R4#show ip bgp
BGP table version is 24, local router ID is 14.0.0.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
*>i 1.0.0.0 2.1.1.1 0 100 0 650012 i
*>i 2.0.0.0 3.1.1.1 0 100 0 i
*> 3.0.0.0 0.0.0.0 0 32768 i
* i 3.1.1.1 0 100 0 i
* 4.0.0.0 4.1.1.2 0 100 0 (650005) i
*> 0.0.0.0 0 32768 i
*> 5.0.0.0 4.1.1.2 0 100 0 (650005) i
* 6.0.0.0 5.1.1.2 0 100 0 (650005) 650006 i
*>i 2.1.1.1 0 100 0 650012 i
*>i 10.0.0.0 2.1.1.1 0 100 0 650012 i
*>i 11.0.0.0/24 2.1.1.1 0 100 0 650012 i
*>i 12.0.0.0/24 2.1.1.1 0 100 0 650012 i
*>i 13.0.0.0/24 3.1.1.1 0 100 0 i
*> 14.0.0.0/24 0.0.0.0 0 32768 i
Network Next Hop Metric LocPrf Weight Path
*> 15.0.0.0/24 4.1.1.2 0 100 0 (650005) i
*> 16.0.0.0/24 5.1.1.2 0 100 0 (650005) 650006 i
*>i 20.0.0.0 2.1.1.1 0 100 0 650012 i
*> 40.0.0.0 0.0.0.0 0 32768 i
*> 50.0.0.0 4.1.1.2 0 100 0 (650005) i
R4#show ip route bgp
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, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
B 1.0.0.0/8 [200/0] via 2.1.1.1, 00:54:11
B 2.0.0.0/8 [200/0] via 3.1.1.1, 00:54:16
B 5.0.0.0/8 [200/0] via 4.1.1.2, 00:27:48
B 6.0.0.0/8 [200/0] via 2.1.1.1, 00:30:49
B 10.0.0.0/8 [200/0] via 2.1.1.1, 00:54:11
11.0.0.0/24 is subnetted, 1 subnets
B 11.0.0.0 [200/0] via 2.1.1.1, 00:54:11
12.0.0.0/24 is subnetted, 1 subnets
B 12.0.0.0 [200/0] via 2.1.1.1, 00:54:11
13.0.0.0/24 is subnetted, 1 subnets
B 13.0.0.0 [200/0] via 3.1.1.1, 00:54:16
15.0.0.0/24 is subnetted, 1 subnets
B 15.0.0.0 [200/0] via 4.1.1.2, 00:29:20
16.0.0.0/24 is subnetted, 1 subnets
B 16.0.0.0 [200/0] via 5.1.1.2, 00:27:48
B 20.0.0.0/8 [200/0] via 2.1.1.1, 00:54:11
B 50.0.0.0/8 [200/0] via 4.1.1.2, 00:29:20
R5#show ip bgp summary
BGP router identifier 15.0.0.1, local AS number 650005
BGP table version is 19, main routing table version 19
16 network entries using 2304 bytes of memory
25 path entries using 2000 bytes of memory
5/4 BGP path/bestpath attribute entries using 680 bytes of memory
4 BGP AS-PATH entries using 96 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 5080 total bytes of memory
BGP activity 16/0 prefixes, 27/2 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
4.1.1.1 4 650034 42 39 19 0 0 00:30:22 12
5.1.1.2 4 650006 43 40 19 0 0 00:28:59 9
R5#show ip bgp
BGP table version is 19, local router ID is 15.0.0.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
* 1.0.0.0 5.1.1.2 0 650006 650012 i
*> 2.1.1.1 0 100 0 (650034) 650012 i
* 2.0.0.0 5.1.1.2 0 650006 650012 i
*> 3.1.1.1 0 100 0 (650034) i
*> 3.0.0.0 4.1.1.1 0 100 0 (650034) i
* 4.0.0.0 4.1.1.1 0 100 0 (650034) i
*> 0.0.0.0 0 32768 i
* 5.0.0.0 5.1.1.2 0 0 650006 i
*> 0.0.0.0 0 32768 i
*> 6.0.0.0 5.1.1.2 0 0 650006 i
* 2.1.1.1 0 100 0 (650034) 650012 i
* 10.0.0.0 5.1.1.2 0 650006 650012 i
*> 2.1.1.1 0 100 0 (650034) 650012 i
* 11.0.0.0/24 5.1.1.2 0 650006 650012 i
Network Next Hop Metric LocPrf Weight Path
*> 2.1.1.1 0 100 0 (650034) 650012 i
* 12.0.0.0/24 5.1.1.2 0 650006 650012 i
*> 2.1.1.1 0 100 0 (650034) 650012 i
*> 13.0.0.0/24 3.1.1.1 0 100 0 (650034) i
*> 14.0.0.0/24 4.1.1.1 0 100 0 (650034) i
*> 15.0.0.0/24 0.0.0.0 0 32768 i
*> 16.0.0.0/24 5.1.1.2 0 0 650006 i
* 20.0.0.0 5.1.1.2 0 650006 650012 i
*> 2.1.1.1 0 100 0 (650034) 650012 i
*> 40.0.0.0 4.1.1.1 0 100 0 (650034) i
*> 50.0.0.0 0.0.0.0 0 32768 i
R5#show ip route bgp
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, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
B 1.0.0.0/8 [200/0] via 2.1.1.1, 00:30:06
B 2.0.0.0/8 [200/0] via 3.1.1.1, 00:30:34
B 3.0.0.0/8 [200/0] via 4.1.1.1, 00:30:39
B 6.0.0.0/8 [20/0] via 5.1.1.2, 00:29:16
B 10.0.0.0/8 [200/0] via 2.1.1.1, 00:30:06
11.0.0.0/24 is subnetted, 1 subnets
B 11.0.0.0 [200/0] via 2.1.1.1, 00:30:06
12.0.0.0/24 is subnetted, 1 subnets
B 12.0.0.0 [200/0] via 2.1.1.1, 00:30:06
13.0.0.0/24 is subnetted, 1 subnets
B 13.0.0.0 [200/0] via 3.1.1.1, 00:30:34
14.0.0.0/24 is subnetted, 1 subnets
B 14.0.0.0 [200/0] via 4.1.1.1, 00:30:39
16.0.0.0/24 is subnetted, 1 subnets
B 16.0.0.0 [20/0] via 5.1.1.2, 00:29:16
B 20.0.0.0/8 [200/0] via 2.1.1.1, 00:30:06
B 40.0.0.0/8 [200/0] via 4.1.1.1, 00:30:39
R6#show ip bgp summary
BGP router identifier 16.0.0.1, local AS number 650006
BGP table version is 28, main routing table version 28
16 network entries using 2304 bytes of memory
31 path entries using 2480 bytes of memory
7/5 BGP path/bestpath attribute entries using 952 bytes of memory
4 BGP AS-PATH entries using 96 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 5832 total bytes of memory
BGP activity 18/2 prefixes, 34/3 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
5.1.1.1 4 650345 42 44 28 0 0 00:30:06 14
6.1.1.2 4 650012 44 43 28 0 0 00:32:55 14
R6#show ip bgp
BGP table version is 28, local router ID is 16.0.0.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found
Network Next Hop Metric LocPrf Weight Path
* 1.0.0.0 5.1.1.1 0 650345 650012 i
*> 6.1.1.2 0 0 650012 i
* 2.0.0.0 5.1.1.1 0 650345 i
*> 6.1.1.2 0 650012 i
*> 3.0.0.0 5.1.1.1 0 650345 i
* 6.1.1.2 0 650012 650345 i
*> 4.0.0.0 5.1.1.1 0 0 650345 i
* 6.1.1.2 0 650012 650345 i
* 5.0.0.0 5.1.1.1 0 0 650345 i
*> 0.0.0.0 0 32768 i
* 6.0.0.0 6.1.1.2 0 0 650012 i
*> 0.0.0.0 0 32768 i
* 10.0.0.0 5.1.1.1 0 650345 650012 i
*> 6.1.1.2 0 0 650012 i
Network Next Hop Metric LocPrf Weight Path
* 11.0.0.0/24 5.1.1.1 0 650345 650012 i
*> 6.1.1.2 0 0 650012 i
* 12.0.0.0/24 5.1.1.1 0 650345 650012 i
*> 6.1.1.2 0 650012 i
*> 13.0.0.0/24 5.1.1.1 0 650345 i
* 6.1.1.2 0 650012 650345 i
*> 14.0.0.0/24 5.1.1.1 0 650345 i
* 6.1.1.2 0 650012 650345 i
*> 15.0.0.0/24 5.1.1.1 0 0 650345 i
* 6.1.1.2 0 650012 650345 i
*> 16.0.0.0/24 0.0.0.0 0 32768 i
* 20.0.0.0 5.1.1.1 0 650345 650012 i
*> 6.1.1.2 0 650012 i
*> 40.0.0.0 5.1.1.1 0 650345 i
* 6.1.1.2 0 650012 650345 i
*> 50.0.0.0 5.1.1.1 0 0 650345 i
* 6.1.1.2 0 650012 650345 i
R6#show ip route bgp
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, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
B 1.0.0.0/8 [20/0] via 6.1.1.2, 00:33:10
B 2.0.0.0/8 [20/0] via 6.1.1.2, 00:33:10
B 3.0.0.0/8 [20/0] via 5.1.1.1, 00:30:21
B 4.0.0.0/8 [20/0] via 5.1.1.1, 00:30:21
B 10.0.0.0/8 [20/0] via 6.1.1.2, 00:33:10
11.0.0.0/24 is subnetted, 1 subnets
B 11.0.0.0 [20/0] via 6.1.1.2, 00:33:10
12.0.0.0/24 is subnetted, 1 subnets
B 12.0.0.0 [20/0] via 6.1.1.2, 00:33:10
13.0.0.0/24 is subnetted, 1 subnets
B 13.0.0.0 [20/0] via 5.1.1.1, 00:30:21
14.0.0.0/24 is subnetted, 1 subnets
B 14.0.0.0 [20/0] via 5.1.1.1, 00:30:21
15.0.0.0/24 is subnetted, 1 subnets
B 15.0.0.0 [20/0] via 5.1.1.1, 00:30:21
B 20.0.0.0/8 [20/0] via 6.1.1.2, 00:33:10
B 40.0.0.0/8 [20/0] via 5.1.1.1, 00:30:21
B 50.0.0.0/8 [20/0] via 5.1.1.1, 00:30:21
(in the next session we will see BGP community local-AS with confederation. if you do not know about BGP community local_AS please click here)
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