Requirement:
- Configure ip addresses as per topology
- Configure one loopback address on each router i.e. 10.10.10.10 on R1 ; 20.20.20.20 on R2 ; 30.30.30.30 on R3 ; 40.40.40.40 on R4 and 50.50.50.50 on R5
- Configure ospf on specified networks
- Configure ibgp and ebgp as per topology
- Configure MPLS on core network
- Verify connectivity annd communication via mpls
Verification commands: - traceroute ip 50.50.50.50 source 40.40.40.40
- traceroute mpls ipv4 50.50.50.50/32 (very imp)
- ping mpls ipv4 30.30.30.30/32
- sh ip route :: Show ip bgp :: clear ip bgp *
- show mpls ldp neigehbor
- show mpls forwarding
- show mpls ldp binding
| ! R1 configuration
hostname R1
ip cef
mpls label protocol ldp
interface Loopback0
ip address 10.10.10.10 255.255.255.0
interface Serial0/0
ip address 1.1.1.1 255.255.255.0
mpls ip
no shut
interface Serial0/1
ip address 9.9.9.1 255.255.255.252
no shut
router ospf 10
redistribute bgp 10 subnets
network 1.1.1.0 0.0.0.255 area 0
network 10.10.10.10 0.0.0.0 area 0
router bgp 10
neighbor 9.9.9.2 remote-as 100
neighbor 9.9.9.2 distribute-list 1 out
neighbor 30.30.30.30 remote-as 10
neighbor 30.30.30.30 update-source Loopback0
neighbor 30.30.30.30 next-hop-self
no auto-summary
access-list 1 deny 50.50.50.50
access-list 1 permit any
! R2 Configuration
hostname R2
ip cef
mpls label protocol ldp
interface Loopback0
ip address 20.20.20.20 255.255.255.255
interface Serial0/0
ip address 1.1.1.2 255.255.255.0
mpls ip
no shut
interface Serial0/1
ip address 1.1.10.1 255.255.255.0
mpls ip
no shut
router ospf 10
network 1.1.1.0 0.0.0.255 area 0
network 1.1.10.0 0.0.0.255 area 0
network 20.20.20.20 0.0.0.0 area 0
| ! R3 Configuration
hostname R3
ip cef
mpls label protocol ldp
interface Loopback0
ip address 30.30.30.30 255.255.255.255
interface Serial0/0
ip address 1.1.10.11 255.255.255.0
mpls ip
no shut
interface Serial0/1
ip address 6.6.6.1 255.255.255.252
no shut
router ospf 10
redistribute bgp 10 subnets
network 1.1.10.0 0.0.0.255 area 0
network 30.30.30.30 0.0.0.0 area 0
router bgp 10
neighbor 6.6.6.2 remote-as 200
neighbor 6.6.6.2 distribute-list 1 out
neighbor 10.10.10.10 remote-as 10
neighbor 10.10.10.10 update-source Loopback0
neighbor 10.10.10.10 next-hop-self
no auto-summary
access-list 1 deny 40.40.40.40
access-list 1 permit any
! R4 Configuration
hostname R4
interface Loopback0
ip address 40.40.40.40 255.255.255.255
interface Serial0/0
ip address 9.9.9.2 255.255.255.252
no shut
router bgp 100
network 40.40.40.40 mask 255.255.255.255
neighbor 9.9.9.1 remote-as 10
no auto-summary
ip route 0.0.0.0 0.0.0.0 9.9.9.1
! R5 Configuration
hostname R5
interface Loopback0
ip address 50.50.50.50 255.255.255.255
interface Serial0/0
ip address 6.6.6.2 255.255.255.252
no shut
router bgp 200
network 50.50.50.50 mask 255.255.255.255
neighbor 6.6.6.1 remote-as 10
no auto-summary
ip route 0.0.0.0 0.0.0.0 6.6.6.1
|
Verification:
R4#traceroute ip 50.50.50.50 source 40.40.40.40
Type escape sequence to abort.
Tracing the route to 50.50.50.50
1 9.9.9.1 56 msec 4 msec 8 msec
2 1.1.1.2 [MPLS: Label 16 Exp 0] 72 msec 16 msec 0 msec
3 1.1.10.11 60 msec 44 msec 20 msec
4 6.6.6.2 64 msec * 132 msec
R1#show mpls forwarding
Local Outgoing Prefix Bytes tag Outgoing Next Hop
tag tag or VC or Tunnel Id switched interface
16 Pop tag 1.1.10.0/24 0 Se0/0 point2point
17 16 50.50.50.50/32 0 Se0/0 point2point
18 Pop tag 20.20.20.20/32 0 Se0/0 point2point
19 19 30.30.30.30/32 0 Se0/0 point2point
R1#
R2#show mpls ldp neighbor
Peer LDP Ident: 10.10.10.10:0; Local LDP Ident 20.20.20.20:0
TCP connection: 10.10.10.10.646 - 20.20.20.20.53911
State: Oper; Msgs sent/rcvd: 151/151; Downstream
Up time: 02:00:22
LDP discovery sources:
Serial0/0, Src IP addr: 1.1.1.1
Addresses bound to peer LDP Ident:
1.1.1.1 9.9.9.1 10.10.10.10
Peer LDP Ident: 30.30.30.30:0; Local LDP Ident 20.20.20.20:0
TCP connection: 30.30.30.30.37364 - 20.20.20.20.646
State: Oper; Msgs sent/rcvd: 145/147; Downstream
Up time: 01:59:44
LDP discovery sources:
Serial0/1, Src IP addr: 1.1.10.11
Addresses bound to peer LDP Ident:
1.1.10.11 6.6.6.1 30.30.30.30
In this lab, we are going to use IBGP and EBGP for peer relationship. HSRP will provide us redundant gateways as if active fail; standby will take the place of active HSRP. Read requirements carefully.
Requiremnents:
- Configure IP Addresses as per diagram. Configure one loop back address 5.5.5.5 on Internet router.
- Configure HSRP on both HSRP1 (Active) and HSRP2 (standby). Track interface between HSRP1 & ISP1 and HSRP2 & ISP2 for fail-over.
- Without doing any configuration related to propagating any network to neighbors, redistribution, static routing. Make sure network 100.10.10.0 should communicate to network 5.5.5.5.
- Packet coming from internet router to LAN should take preffered path and ensure that secondary path route becomes less preferred as compared to preferred path
- Demonstrate internet router path for 100.10.10.0 network by using show ip bgp 100.10.10.0 command and by traceroute.
| ! HSRP1 Configuration
interface Serial0/0
ip address 16.16.16.1 255.255.255.0
no shut
interface FastEthernet0/1
ip address 100.10.10.1 255.255.255.0
no shut
standby 10 ip 100.10.10.100
standby 10 priority 150
standby 10 preempt delay minimum 70
standby 10 track Serial0/0 60
router bgp 50
network 100.10.10.0 mask 255.255.255.0
neighbor 16.16.16.2 remote-as 80
neighbor 100.10.10.2 remote-as 50
neighbor 100.10.10.2 next-hop-self
! HSRP2 Configuration
interface FastEthernet0/0
ip address 100.10.10.2 255.255.255.0
no shut
standby 10 ip 100.10.10.100
standby 10 priority 120
standby 10 preempt
standby 10 track Serial0/0
interface Serial0/0
ip address 22.22.22.1 255.255.255.0
no shut
router bgp 50
network 100.10.10.0 mask 255.255.255.0
neighbor 22.22.22.2 remote-as 200
neighbor 22.22.22.2 route-map AS-Path-Append out
neighbor 100.10.10.1 remote-as 50
neighbor 100.10.10.1 next-hop-self
access-list 10 permit 100.10.10.0
route-map AS-Path-Append permit 10
match ip address 10
set as-path prepend 50
! ISP1 Configuration
interface Serial0/0
ip address 16.16.16.2 255.255.255.0
no shut
interface Serial0/1
ip address 160.16.16.1 255.255.255.0
no shut
router bgp 80
neighbor 16.16.16.1 remote-as 50
neighbor 160.16.16.2 remote-as 500
! ISP2 Configuration
interface Serial0/0
ip address 22.22.22.2 255.255.255.0
no shut
interface Serial0/1
ip address 210.16.16.2 255.255.255.0
no shut
router bgp 200
neighbor 22.22.22.1 remote-as 50
neighbor 210.16.16.1 remote-as 500
! Internet Configuration
interface Loopback0
ip address 5.5.5.5 255.255.255.0
interface Serial0/0
ip address 160.16.16.2 255.255.255.0
no shut
interface Serial0/1
ip address 210.16.16.1 255.255.255.0
no shut
router bgp 500
network 5.5.5.0 mask 255.255.255.0
neighbor 160.16.16.1 remote-as 80
neighbor 210.16.16.2 remote-as 200
| Configuration Explanation
70 seconds delay so that BGP routes get into routing table.
Tracking serial 0/0 so that if it gets failed; HSRP shift role to standby router
when communicating to neighbor 22.22.22.2 and sending information out to it; BGP should consult route-map name AS-PAth-Append
Access list 10 permitting route. (We use this in route map)
Here comes route map
route map will match all ip addresses in access list 10
if match found then it will prepend its AS-Path attribute with 50. This will let outside world (AS) perceive that this route is the longest one as compared some other actually equal route.
|
BGP network verification
Internet#show ip bgp 100.10.10.0
BGP routing table entry for 100.10.10.0/24, version 3
Paths: (2 available, best #2, table Default-IP-Routing-Table)
Flag: 0x820
Advertised to update-groups:
1
200 50 50 [Look here you see that actual AS-Path should have (200 50) but due to route map and AS-Path prepend applied on HSRP2 router; Router AS path is showing that this route will go from 3 AS]
210.16.16.2 from 210.16.16.2 (210.16.16.2)
Origin IGP, localpref 100, valid, external
80 50 [Here there are 2 AS in AS-Path; hence preferable]
160.16.16.1 from 160.16.16.1 (160.16.16.1)
Origin IGP, localpref 100, valid, external, best
| Trace route verification
When both HSRP routers are running cool and tracked interfaces have no issues at all. Following is the trace route.
pc1V10[1]> tracert 5.5.5.5
traceroute to 5.5.5.5, 64 hops max, press Ctrl+C to stop
1 100.10.10.1 70.000 ms 62.000 ms 40.000 ms
2 16.16.16.2 80.000 ms 40.000 ms 36.000 ms
3 *160.16.16.2 107.000 ms
(Please note that as 5.5.5.5 is a loopback thats why
traceroute just stops here)
Anyhow see the path. PAckets are taking HSRP1 path.
|
Now I have shutdown HSRP and ISP1 interface so that HSRP2 should take Active role. Now see results
| Internet#show ip bgp 100.10.10.0
BGP routing table entry for 100.10.10.0/24, version 4
Paths: (1 available, best #1, table Default-IP-Routing-Table)
Flag: 0x820
Advertised to update-groups:
1
200 50 50
210.16.16.2 from 210.16.16.2 (210.16.16.2)
Origin IGP, localpref 100, valid, external, best
Please note that now previously preferred route is not there
| pc1V10[1]> tracert 5.5.5.5
traceroute to 5.5.5.5, 64 hops max, press Ctrl+C to stop
1 100.10.10.2 60.000 ms 30.000 ms 30.000 ms
2 22.22.22.2 60.000 ms 40.000 ms 40.000 ms
3 *210.16.16.1 72.000 ms
(Please note that as 5.5.5.5 is a loopback thats why
traceroute just stops here)
Anyhow see the path. PAckets are taking HSRP2 path.
|
Multihomed Border Gateway Protocol (BGP) network where you have connections to more then one separate Internet service providers (ISPs). In the event of a failure of connectivity toward one ISP, the traffic is rerouted dynamically through the other ISP with the Hot Standby Router Protocol (HSRP).
Requirements:
- Configure IP Addresses on physical and vlan interfaces as per diagram
- Configure HSRP on MLS1 and MLS2 so that MLS1 become HSRP Active and MLS2 will act as standby. MLS2 should take Active role if MLS one gets down or Interface between MLS1 and ISP goes down..
- Configure EBGP neighbor relationship as required
- Redistribute connected interfaces via BGP. MLS1 and MLS2 should not redistribute their connected interface
- Send routing information of 100.10.10.0 network to all network routers via BGP.
- Find result by pinging all interfaces and by finding traceroute of all interfaces
| ! MLS1HSRP1active Configuration
interface FastEthernet0/0
ip address 1.1.1.1 255.255.255.252
no shut
interface Vlan1
ip address 100.10.10.1 255.255.255.0
standby 10 ip 100.10.10.100
standby 10 priority 90
standby 10 preempt
standby 10 track FastEthernet0/0
router bgp 65222
network 100.10.10.0 mask 255.255.255.0
neighbor 1.1.1.2 remote-as 10
! ISP Configuration
interface FastEthernet0/0
ip address 1.1.1.2 255.255.255.252
no shut
interface Serial0/0
ip address 11.1.1.1 255.255.255.252
no shut
router bgp 10
redistribute connected
neighbor 1.1.1.1 remote-as 65222
neighbor 11.1.1.2 remote-as 20
! R8 Configuration
interface Serial0/0
ip address 11.1.1.2 255.255.255.252
no shut
interface Serial0/1
ip address 150.1.1.1 255.255.255.252
no shut
router bgp 20
redistribute connected
neighbor 11.1.1.1 remote-as 10
neighbor 150.1.1.2 remote-as 333
! R10 Configuration
interface Serial0/0
ip address 150.1.1.2 255.255.255.252
no shut
interface Serial0/1
ip address 170.1.1.1 255.255.255.252
no shut
interface Serial0/2
ip address 12.1.1.1 255.255.255.252
no shut
router bgp 333
redistribute connected
neighbor 12.1.1.2 remote-as 440
neighbor 150.1.1.1 remote-as 20
neighbor 170.1.1.2 remote-as 200
| ! MLS2HSRP2standby Configuration
interface FastEthernet0/0
ip address 2.2.2.1 255.255.255.252
no shut
interface Vlan1
ip address 100.10.10.2 255.255.255.0
standby 10 ip 100.10.10.100
standby 10 priority 50
standby 10 preempt
standby 10 track FastEthernet0/0
router bgp 65222
network 100.10.10.0 mask 255.255.255.0
neighbor 2.2.2.2 remote-as 100
! ISP2 Configuration
interface FastEthernet0/0
ip address 2.2.2.2 255.255.255.252
no shut
interface Serial0/0
ip address 22.1.1.1 255.255.255.252
no shut
router bgp 100
redistribute connected
neighbor 2.2.2.1 remote-as 65222
neighbor 22.1.1.2 remote-as 200
! R9 Configuration
interface Serial0/0
ip address 22.1.1.2 255.255.255.252
no shut
interface Serial0/1
ip address 170.1.1.2 255.255.255.252
no shut
router bgp 200
redistribute connected
neighbor 22.1.1.1 remote-as 100
neighbor 170.1.1.1 remote-as 333
! Internet Configuration
interface Loopback0
ip address 44.44.44.44 255.255.255.255
interface Serial0/0
ip address 12.1.1.2 255.255.255.252
no shut
router bgp 440
redistribute connected
neighbor 12.1.1.1 remote-as 333
|
BGP confederation is used to reduce iBGP mesh within an AS. We can use many smaller private Autonomous systems with in one confederation ID. Routers with in each private AS are configured with full ibgo mesh. Each private AS with in confederation will communicate to other private AS in same confederation via EBGP. Other Confederations and Autonomous systems will see and communicate via Confederation ID.
REQUIREMENT:
Configure IP addresses as given in topology
Configure loopback 0 on R1 (11.11.11.11/32) and R4 (44.44.44.44/32)
Configure static routes on R9. Routes are 99.99.99.0/30 ; 99.99.99.4/30 ; 99.99.99.8/30 ; 99.99.99.12/30
Configure IBGP and EBGP as per topology
Configure IGP as if required
Configure Confederations as per topology
Redistribute all static routes of R9 to BGP
Verification
Verify neighbor relationships
Verify routes and find if all networks are reachable from everyone
Verify bgp tables
| Router 1 Configuration
R1#config terminal
R1(config)#interface serial 0/0
R1(config-if)#ip address 1.1.1.1 255.255.255.0
R1(config-if)#no shutdown
R1(config-if)#clock rate 64000
R1(config)#interface loopback 0
R1(config-if)#ip address 11.11.11.11 255.255.255.255
R1(config)#router rip
R1(config-router)#version 2
R1(config-router)#no auto-summary
R1(config-router)#network 1.1.1.0
R1(config)#router bgp 1
R1(config-router)#network 11.11.11.11 mask 255.255.255.255
R1(config-router)#neighbor 1.1.1.2 remote-as 2
Router 2 Configuration
R2#conf t
R2(config)#interface serial 0/0
R2(config-if)#no shutdown
R2(config-if)#ip address 50.1.1.1 255.255.255.0
R2(config)#interface serial 0/1
R2(config-if)#no shutdown
R2(config-if)#ip address 10.1.1.2 255.255.255.0
R2(config)#router rip
R2(config-router)#version 2
R2(config-router)#no auto-summary
R2(config-router)#network 10.1.1.0
R2(config-router)#network 50.1.1.0
R2(config)#router bgp 65502
R2(config-router)#neighbor 10.1.1.1 remote-as 65502
R2(config-router)#neighbor 50.1.1.2 remote-as 65504
R2(config-router)#bgp confederation identifier 2
R2(config-router)#bgp confederation peers 65504
Router 3 Configuration
R3#conf t
R3(config)#interface serial 0/0
R3(config-if)#no shutdown
R3(config-if)#ip address 50.1.1.2 255.255.255.0
R3(config)#interface serial 0/1
R3(config-if)#no shutdown
R3(config-if)#ip address 100.1.1.1 255.255.255.0
R3(config)#router rip
R3(config-router)#version 2
R3(config-router)#no auto-summary
R3(config-router)#network 50.1.1.0
R3(config-router)#network 100.1.1.0
R3(config)#router bgp 65504
R3(config-router)#neighbor 50.1.1.1 remote-as 65502
R3(config-router)#neighbor 100.1.1.2 remote-as 65504
R3(config-router)#bgp confederation identifier 2
R3(config-router)#bgp confederation peers 65502
Router 4 Configuration
R4#conf t
R4(config)#interface serial 0/0
R4(config-if)#no shutdown
R4(config-if)#ip address 100.1.1.2 255.255.255.0
R4(config)#int serial 0/1
R4(config-if)#no shutdown
R4(config-if)#ip address 2.2.2.1 255.255.255.0
R4(config)#int loopback 0
R4(config-if)#ip add 44.44.44.44 255.255.255.255
R4(config)#router rip
R4(config-router)#no auto-summary
R4(config-router)#version 2
R4(config-router)#network 100.1.1.0
R4(config-router)#network 2.2.2.0
R4(config)#router bgp 65504
R4(config-router)#neighbor 100.1.1.1 remote-as 65504
R4(config-router)#neighbor 2.2.2.2 remote-as 20
R4(config-router)#network 44.44.44.44 255.255.255.255
R4(config-router)#bgp confederation identifier 2
R4(config-router)#bgp confederation peers 65502
Router 5 Configuration
R5#configure terminal
R5(config)#int serial 0/0
R5(config-if)#no shutdown
R5(config-if)#ip address 10.1.1.1 255.255.255.0
R5(config)#int serial 0/1
R5(config-if)#ip address 1.1.1.2 255.255.255.0
R5(config-if)#no shutdown
R5(config)#router rip
R5(config-router)#no auto-summary
R5(config-router)#version 2
R5(config-router)#network 1.1.1.0
R5(config-router)#network 10.1.1.0
R5(config)#router bgp 65502
R5(config-router)#neighbor 1.1.1.1 remote-as 1
R5(config-router)#neighbor 10.1.1.2 remote-as 65502
R5(config-router)#bgp confederation identifier 2
R5(config-router)#bgp confederation peers 65504
Router 6 Configuration
R6#conf t
R6(config)#interface serial 0/0
R6(config-if)#ip address 2.2.2.2 255.255.255.0
R6(config)#interface serial 0/1
R6(config-if)#no shutdown
R6(config-if)#ip address 100.100.100.1 255.255.255.0
R6(config)#router rip
R6(config-router)#no auto-summary
R6(config-router)#version 2
R6(config-router)#network 2.2.2.0
R6(config-router)#network 100.100.100.0
R6(config)#router bgp 65504
R6(config-router)#neighbor 2.2.2.1 remote-as 2
R6(config-router)#neighbor 100.100.100.2 remote-as 65505
R6(config-router)#bgp confederation identifier 20
R6(config-router)#bgp confederation peers 65505
Router 7 Configuration
R7#conf t
R7(config)#interface serial 0/0
R7(config-if)#no shutdown
R7(config-if)#ip address 100.100.100.2 255.255.255.0
R7(config)#interface serial 0/1
R7(config-if)#no shutdown
R7(config-if)#ip address 10.10.10.1 255.255.255.0
R7(config)#router rip
R7(config-router)#no auto-summary
R7(config-router)#version 2
R7(config-router)#network 100.100.100.0
R7(config-router)#network 10.10.10.0
R7(config)#router bgp 65505
R7(config-router)#neighbor 10.10.10.2 remote-as 65502
R7(config-router)#neighbor 100.100.100.1 remote-as 65504
R7(config-router)#bgp confederation identifier 20
R7(config-router)#bgp confederation peers 65502 65504
Router 8 Configuration
R8#conf t
R8(config)#interface serial 0/0
R8(config-if)#no shutdown
R8(config-if)#ip address 10.10.10.2 255.255.255.0
R8(config)#interface serial 0/1
R8(config-if)#no shutdown
R8(config-if)#ip address 1.1.2.1 255.255.255.0
R8(config)#router rip
R8(config-router)#no auto-summary
R8(config-router)#version 2
R8(config-router)#network 10.10.10.0
R8(config-router)#network 1.1.2.0
R8(config)#router bgp 65502
R8(config-router)#neighbor 10.10.10.1 remote-as 65505
R8(config-router)#neighbor 1.1.2.2 remote-as 30
R8(config-router)#bgp confederation identifier 20
R8(config-router)#bgp confederation peers 65505
Router 9 Configuration
R9#conf t
R9(config)#interface serial 0/0
R9(config-if)#no shutdown
R9(config-if)#ip address 1.1.2.2 255.255.255.0
R9(config)#ip route 99.99.99.0 255.255.255.252 null 0
R9(config)#ip route 99.99.99.4 255.255.255.252 null 0
R9(config)#ip route 99.99.99.8 255.255.255.252 null 0
R9(config)#ip route 99.99.99.12 255.255.255.252 null 0
R9(config)#router rip
R9(config-router)#no auto-summary
R9(config-router)#version 2
R9(config-router)#network 1.1.2.0
R9(config)#router bgp 30
R9(config-router)#neighbor 1.1.2.1 remote-as 20
R9(config-router)#redistribute static
| Configuration Explanation
Providing IP addresses to serial 0/0 interface
Providing IP addresses to Loopback0 interface
We are introducing RIP protocol as IGP.
version 2 for classless routing or discontegeous network support
Propagate subnets rather summary address
Configuring BGP AS 1
Propagating 11.11.11.11 via BGP
Making neighbor relationship with 1.1.1.2 of R5 in confederation 2
Configuration Explanation
Providing IP address to S 0/0
Providing IP address to S 0/1
Running RIP as IGP (Interior gateway protocol)
Running BGP with private AS 65502
Making neighbor relationship with 10.1.1.1
Making neighbor relationship with 50.1.1.2
This command is used to tell BGP that this private AS (65502) is a member of confederation 2. confederation AS 2 will be used to communicate outer world.
This command is telling router that our private AS (65502) has peer relationship with another private AS (65504) of same confederation 2
Configuration Explanation
Providing IP address to S 0/0
Providing IP address to S 0/1
Running RIP as IGP (Interior gateway protocol)
Running BGP with private AS 65504
Making neighbor relationship with 50.1.1.1
Making neighbor relationship with 100.1.1.2
This command is used to tell BGP that this private AS (65504) is a member of confederation 2. confederation AS 2 will be used to communicate outer world.
This command is telling router that our private AS (65504) has peer relationship with another private AS (65502) of same confederation 2
Configuration Explanation
Providing IP address to S 0/0
Providing IP address to S 0/1
Providing ip address to loopback 0
Running RIP as IGP (Interior gateway protocol)
Running BGP with private AS 65504
Making neighbor relationship with 100.1.1.1
Making neighbor relationship with 2.2.2.2
This command is used to tell BGP that this private AS (65504) is a member of confederation 2. confederation AS 2 will be used to communicate outer world.
This command is telling router that our private AS (65504) has peer relationship with another private AS (65502) of same confederation 2
Configuration Explanation
Providing IP address to S 0/0
Providing IP address to S 0/1
Running RIP as IGP (Interior gateway protocol)
Running BGP with private AS 65502
Making neighbor relationship with 1.1.1.1
Making neighbor relationship with 10.1.1.2
This command is used to tell BGP that this private AS (65504) is a member of confederation 2. confederation AS 2 will be used to communicate outer world.
This command is telling router that our private AS (65502) has peer relationship with another private AS (65504) of same confederation 2
Configuration Explanation
Providing IP address to S 0/0
Providing IP address to S 0/1
Running RIP as IGP (Interior gateway protocol)
Running BGP with private AS 65504
Making neighbor relationship with 2.2.2.1
Making neighbor relationship with 100.100.100.2
This command is used to tell BGP that this private AS (65504) is a member of confederation 20. confederation AS 20 will be used to communicate outer world.
This command is telling router that our private AS (65504) has peer relationship with another private AS (65505) of same confederation 2
Configuration Explanation
Providing IP address to S 0/0
Providing IP address to S 0/1
Running RIP as IGP (Interior gateway protocol)
Running BGP with private AS 65504
Making neighbor relationship with 10.10.10.2
Making neighbor relationship with 100.100.100.1
This command is used to tell BGP that this private AS (65505) is a member of confederation 20. confederation AS 20 will be used to communicate outer world.
This command is telling router that our private AS (65505) has peer relationship with two other private AS (65502 and 65504) of same confederation 2
Configuration Explanation
Providing IP address to S 0/0
Providing IP address to S 0/1
Running RIP as IGP (Interior gateway protocol)
Running BGP with private AS 65502
Making neighbor relationship with 10.10.10.1
Making neighbor relationship with 1.1.2.2
This command is used to tell BGP that this private AS (65502) is a member of confederation 20. confederation AS 20 will be used to communicate outer world.
This command is telling router that our private AS (65502) has peer relationship with another private AS (65505) of same confederation 20
Configuration Explanation
Providing IP address to S 0/0
Static IP routes null 0 interface
Running RIP as IGP (Interior gateway protocol)
Running BGP with AS 30
Making neighbor relationship with 1.1.2.1
Redistributing static routes
|
Now we will examine routing table of routers by show ip route command. I will only check R1 and R9 as if they are having good all routes then things will likely be OK in between but you should check during learning process all routers routing table
I am ending this lab over here. You can also try two commands
Show ip bgp summary
Debug ip bgp
Requirement:- Configure IP Addresses on interfaces
- Configure R1 loopback 10.1.1.1 ; R2 loopback 20.1.1.1 ; R3 loopback 30.1.1.1
- Configure static route on R1 and redistribute it to bgp
- Configure IBGP AS 20 on all routers
- Make neighbor relationship
- BGP split horizon will not allow R2 to propagate one neighbor's route to other.
Look into routing tables and neighbor tables of bgp. Try to find interesting results.
Verification commands:Show ip routeShow ip bgp summaryShow ip bgpDebug ip bgp => Always use this command to verify and learn
| Router 1 Configuration
R1(config)#interface Loopback0
R1(config-if)# ip address 10.1.1.1 255.255.255.0
R1(config-if)#interface Serial0/0
R1(config-if)# ip address 1.1.1.1 255.255.255.252
R1(config-if)# clock rate 64000
R1(config-if)#no shutdown
R1(config-if)#ip route 12.12.12.12 255.255.255.255 Null0
R1(config)#router bgp 20
R1(config-router)# network 1.1.1.0 mask 255.255.255.252
R1(config-router)# network 10.1.1.0 mask 255.255.255.0
R1(config-router)# redistribute static
R1(config-router)# neighbor 1.1.1.2 remote-as 20
Router 2 Configuration
R2#conf t
R2(config)#interface Loopback0
R2(config-if)# ip address 20.1.1.1 255.255.255.0
R2(config-if)#interface Serial0/0
R2(config-if)# ip address 1.1.1.2 255.255.255.252
R2(config-if)# clock rate 2000000
R2(config-if)#no shutdown
R2(config-if)#interface Serial0/1
R2(config-if)# ip address 2.2.2.1 255.255.255.252
R2(config-if)# clock rate 64000
R2(config-if)#no shutdown
R2(config)#router bgp 20
R2(config-router)# network 1.1.1.0 mask 255.255.255.252
R2(config-router)# network 2.2.2.0 mask 255.255.255.252
R2(config-router)# network 20.1.1.0 mask 255.255.255.0
R2(config-router)# neighbor 1.1.1.1 remote-as 20
R2(config-router)# neighbor 2.2.2.2 remote-as 20
Router 3 Configuration
R3(config)#interface Loopback0
R3(config-if)# ip address 30.1.1.1 255.255.255.0
R3(config-if)#interface Serial0/0
R3(config-if)# ip address 2.2.2.2 255.255.255.252
R3(config-if)#no shut
R3(config-if)#router bgp 20
R3(config-router)# network 2.2.2.0 mask 255.255.255.252
R3(config-router)# network 30.1.1.0 mask 255.255.255.0
R3(config-router)# neighbor 2.2.2.1 remote-as 20
| Configuration Explanation
Configuring loop back interface
Configuring serial 0/0 interface
Static route to Null 0 interface
Configuring BGP for Autonomous system 20
Propagating network 1.1.1.0
Propagating network 10.1.1.0
Redistributing static routes to BGP
Making neighbor relationship with 1.1.1.2 of R2
Configuring loop back interface
Configuring serial 0/0 interface
Configuring serial 0/1 interface
Configuring BGP for Autonomous system 20
Propagating network 1.1.1.0
Propagating network 2.2.2.0
Propagating network 20.1.1.0
Making neighbor relationship with 1.1.1.1 of R1
Making neighbor relationship with 2.2.2.2 of R3
Configuring Loopback 0 interface
Configuring serial 0/0 interface
Configuring BGP 20
Propagating network 2.2.2.0
Propagating network 30.1.1.0
Making neighbor relationship with 2.2.2.1 of R2 |
Verification Command
R1# Show ip route
R2# Show ip route
R3# Show ip route
R2 has all routes from R1 and R3 but due to split horizon rule; R2 is not sending R1's route to R3 and R3 routes to R1
Let's see neighbor table of all three routers
Command
R1# Show ip bgp summary
R2# Show ip bgp summary
R3# Show ip bgp summary
Let's see all possible routes of BGP. Look at following snapshot
This output is showing Router ID.
* means all valid routes
> means best route between all possible routes to a network
In this Lab, We are configuring all three routers in three different autonomous systems and making them EBGP neighbor.
Basic Configuration of Topology
R1 (Router 1)
interface Loopback0
ip address 10.1.1.1 255.255.255.0
interface Serial0/0
ip address 1.1.1.1 255.255.255.252
clock rate 64000
no sh
router bgp 1
network 1.1.1.0 mask 255.255.255.252
network 10.1.1.0 mask 255.255.255.0
neighbor 1.1.1.2 remote-as 2
Router: 2
interface Loopback0
ip address 20.1.1.1 255.255.255.0
interface Serial0/0
ip address 1.1.1.2 255.255.255.252
clock rate 64000
no sh
interface Serial0/1
ip address 2.2.2.1 255.255.255.252
clock rate 64000
no sh
router bgp 2
network 1.1.1.0 mask 255.255.255.252
network 2.2.2.0 mask 255.255.255.252
network 20.1.1.0 mask 255.255.255.0
neighbor 1.1.1.1 remote-as 1
neighbor 2.2.2.2 remote-as 3
Router-3
interface Loopback0
ip address 30.1.1.1 255.255.255.0
interface Serial0/0
ip address 2.2.2.2 255.255.255.252
clock rate 64000
no sh
router bgp 3
network 2.2.2.0 mask 255.255.255.252
network 30.1.1.0 mask 255.255.255.0
neighbor 2.2.2.1 remote-as 2
Verification Commands:
For routing table: Show ip route
For BGP neighbour relationship: show ip bgp summary
For BGP full routing information: Show ip bgp
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