目录
实验需求：按照规划建立BGP对等关系，R1和R5各发布一条路由，保证两个网段可以互相通信
1.首先配置IP
r1
r2
r3
r4
r5
2.AS之间建立EBGP直连邻居关系
r1和r2之间
r4和r5之间
3.AS内部建立IBGP对等体邻居关系
首先建立ospf使内部建立通讯连接
然后建立IBGP
4.使r1和r5的路由互相通信
1.将r1的环回下发
将下一跳的属性修改为自身
可以在r5上看到已下发的路由
2.将r5的环回下发到r1
将r5的环回下发
将下一跳的属性修改为自身
可以在r1上看到已下发的路由
5.验证实验需求
实验需求：按照规划建立BGP对等关系，R1和R5各发布一条路由，保证两个网段可以互相通信
1.首先配置IP
r1
[r1]int g0/0/0
[r1-GigabitEthernet0/0/0]ip add 12.0.0.1 24
[r1-GigabitEthernet0/0/0]int l0
[r1-LoopBack0]ip add 1.1.1.1 24
r2
[r2]int g0/0/0
[r2-GigabitEthernet0/0/0]ip add 12.0.0.2 24
[r2-GigabitEthernet0/0/0]int l0
[r2-LoopBack0]ip add 2.2.2.2 24
[r2-LoopBack0]int g0/0/1
[r2-GigabitEthernet0/0/1]ip add 23.0.0.1 24
r3
[r3]int g0/0/0
[r3-GigabitEthernet0/0/0]ip add 23.0.0.2 24
[r3-GigabitEthernet0/0/0]int l0
[r3-LoopBack0]ip add 3.3.3.3 24
[r3-LoopBack0]int g0/0/1
[r3-GigabitEthernet0/0/1]ip add 34.0.0.1 24r4
[r4]int g0/0/0
[r4-GigabitEthernet0/0/0]ip add 34.0.0.2 24
[r4-GigabitEthernet0/0/0]int l0
[r4-LoopBack0]ip add 4.4.4.4 24
[r4-LoopBack0]int g0/0/1
[r4-GigabitEthernet0/0/1]ip add 45.0.0.1 24r5
[r5]int g0/0/0
[r5-GigabitEthernet0/0/0]ip add 45.0.0.2 24
[r5-GigabitEthernet0/0/0]int l0
[r5-LoopBack0]ip add 5.5.5.5 242.AS之间建立EBGP直连邻居关系
r1和r2之间
[r1]bgp 1
[r1-bgp]router-id 1.1.1.1
[r1-bgp]peer 12.0.0.2 as-number 2
Oct 7 2022 17:08:41-08:00 r1 %%01BGP/3/STATE_CHG_UPDOWN(l)[0]:The status of thepeer 12.0.0.2 changed from OPENCONFIRM to ESTABLISHED. (InstanceName=Public, St
ateChangeReason=Up)
[r1-bgp]display bgp peerBGP local router ID : 1.1.1.1Local AS number : 1Total number of peers : 1 Peers in established state : 1Peer V AS MsgRcvd MsgSent OutQ Up/Down State PrefRcv12.0.0.2 4 2 2 4 0 00:00:03 Established 0
[r2]bgp 2
[r2-bgp]router-id 2.2.2.2
[r2-bgp]peer 12.0.0.1 as-number 1
Oct 7 2022 17:08:41-08:00 r2 %%01BGP/3/STATE_CHG_UPDOWN(l)[0]:The status of thepeer 12.0.0.1 changed from OPENCONFIRM to ESTABLISHED. (InstanceName=Public, St
ateChangeReason=Up)
[r2-bgp]display bgp peerBGP local router ID : 2.2.2.2Local AS number : 2Total number of peers : 1 Peers in established state : 1Peer V AS MsgRcvd MsgSent OutQ Up/Down State PrefRcv12.0.0.1 4 1 3 3 0 00:01:20 Established 0r4和r5之间
[r4]bgp 2
[r4-bgp]router-id 4.4.4.4
[r4-bgp]peer 45.0.0.2 as-number 3
Oct 7 2022 17:12:40-08:00 r4 %%01BGP/3/STATE_CHG_UPDOWN(l)[0]:The status of thepeer 45.0.0.2 changed from OPENCONFIRM to ESTABLISHED. (InstanceName=Public, St
ateChangeReason=Up)
[r4-bgp]display bgp peerBGP local router ID : 4.4.4.4Local AS number : 2Total number of peers : 1 Peers in established state : 1Peer V AS MsgRcvd MsgSent OutQ Up/Down State PrefRcv45.0.0.2 4 3 2 3 0 00:00:13 Established 0[r5]bgp 3
[r5-bgp]router-id 5.5.5.5
[r5-bgp]peer 45.0.0.1 as-number 2
Oct 7 2022 17:12:40-08:00 r5 %%01BGP/3/STATE_CHG_UPDOWN(l)[0]:The status of thepeer 45.0.0.1 changed from OPENCONFIRM to ESTABLISHED. (InstanceName=Public, St
ateChangeReason=Up)
[r5-bgp]display bgp peerBGP local router ID : 5.5.5.5Local AS number : 3Total number of peers : 1 Peers in established state : 1Peer V AS MsgRcvd MsgSent OutQ Up/Down State PrefRcv45.0.0.1 4 2 2 2 0 00:00:58 Established 03.AS内部建立IBGP对等体邻居关系
首先建立ospf使内部建立通讯连接
[r2]ospf 1 router-id 2.2.2.2
[r2-ospf-1]a 0
[r2-ospf-1-area-0.0.0.0]network 23.0.0.0 0.0.0.255
[r2-ospf-1-area-0.0.0.0]network 2.2.2.2 0.0.0.0[r3]ospf 1 router-id 3.3.3.3
[r3-ospf-1]a 0
[r3-ospf-1-area-0.0.0.0]network 23.0.0.0 0.0.0.255
[r3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0
[r3-ospf-1-area-0.0.0.0]network 34.0.0.0 0.0.0.255[r4]ospf 1 router-id 4.4.4.4
[r4-ospf-1]a 0
[r4-ospf-1-area-0.0.0.0]network 34.0.0.0 0.0.0.255
[r4-ospf-1-area-0.0.0.0]network 4.4.4.4 0.0.0.0然后建立IBGP
[r2]bgp 2
[r2-bgp]peer 3.3.3.3 as-number 2
[r2-bgp]peer 3.3.3.3 connect-interface LoopBack 0
[r2-bgp]peer 4.4.4.4 as-number 2
[r2-bgp]peer 4.4.4.4 connect-interface LoopBack 0[r3]bgp 2
[r3-bgp]router-id 3.3.3.3
[r3-bgp]peer 2.2.2.2 as-number 2
[r3-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[r3-bgp]peer 4.4.4.4 as-number 2
[r3-bgp]peer 4.4.4.4 connect-interface LoopBack 0[r4-bgp]bgp 2
[r4-bgp]peer 2.2.2.2 as-number 2
[r4-bgp]peer 2.2.2.2 connect-interface LoopBack 0
[r4-bgp]peer 3.3.3.3 as-number 2
[r4-bgp]peer 3.3.3.3 connect-interface LoopBack 04.使r1和r5的路由互相通信
1.将r1的环回下发
[r1]bgp 1
[r1-bgp]network 1.1.1.0 24
[r1]display bgp routing-table BGP Local router ID is 1.1.1.1 Status codes: * - valid, > - best, d - damped,h - history, i - internal, s - suppressed, S - StaleOrigin : i - IGP, e - EGP, ? - incompleteTotal Number of Routes: 1Network NextHop MED LocPrf PrefVal Path/Ogn*> 1.1.1.0/24 0.0.0.0 0 0 i将下一跳的属性修改为自身
[r2-bgp]peer 3.3.3.3 next-hop-local
[r2-bgp]peer 4.4.4.4 next-hop-local可以在r5上看到已下发的路由
[r5]display bgp routing-table BGP Local router ID is 5.5.5.5 Status codes: * - valid, > - best, d - damped,h - history, i - internal, s - suppressed, S - StaleOrigin : i - IGP, e - EGP, ? - incompleteTotal Number of Routes: 1Network NextHop MED LocPrf PrefVal Path/Ogn*> 1.1.1.0/24 45.0.0.1 0 2 1i2.将r5的环回下发到r1
将r5的环回下发
[r5-bgp]network 5.5.5.0 24
[r5]display bgp routing-table BGP Local router ID is 5.5.5.5 Status codes: * - valid, > - best, d - damped,h - history, i - internal, s - suppressed, S - StaleOrigin : i - IGP, e - EGP, ? - incompleteTotal Number of Routes: 2Network NextHop MED LocPrf PrefVal Path/Ogn*> 1.1.1.0/24 45.0.0.1 0 2 1i*> 5.5.5.0/24 0.0.0.0 0 0 i
将下一跳的属性修改为自身
[r4-bgp]peer 3.3.3.3 next-hop-local
[r4-bgp]peer 2.2.2.2 next-hop-local可以在r1上看到已下发的路由
[r1]display bgp routing-table BGP Local router ID is 1.1.1.1 Status codes: * - valid, > - best, d - damped,h - history, i - internal, s - suppressed, S - StaleOrigin : i - IGP, e - EGP, ? - incompleteTotal Number of Routes: 2Network NextHop MED LocPrf PrefVal Path/Ogn*> 1.1.1.0/24 0.0.0.0 0 0 i*> 5.5.5.0/24 12.0.0.2 0 2 3i
5.验证实验需求
[r1]ping -a 1.1.1.1 5.5.5.5PING 5.5.5.5: 56 data bytes, press CTRL_C to breakReply from 5.5.5.5: bytes=56 Sequence=1 ttl=252 time=80 msReply from 5.5.5.5: bytes=56 Sequence=2 ttl=252 time=50 msReply from 5.5.5.5: bytes=56 Sequence=3 ttl=252 time=30 msReply from 5.5.5.5: bytes=56 Sequence=4 ttl=252 time=40 msReply from 5.5.5.5: bytes=56 Sequence=5 ttl=252 time=40 ms--- 5.5.5.5 ping statistics ---5 packet(s) transmitted5 packet(s) received0.00% packet lossround-trip min/avg/max = 30/48/80 ms
-------------------------------------------------------------------------------------
[r5]ping -a 5.5.5.5 1.1.1.1PING 1.1.1.1: 56 data bytes, press CTRL_C to breakReply from 1.1.1.1: bytes=56 Sequence=1 ttl=252 time=40 msReply from 1.1.1.1: bytes=56 Sequence=2 ttl=252 time=50 msReply from 1.1.1.1: bytes=56 Sequence=3 ttl=252 time=30 msReply from 1.1.1.1: bytes=56 Sequence=4 ttl=252 time=40 msReply from 1.1.1.1: bytes=56 Sequence=5 ttl=252 time=40 ms--- 1.1.1.1 ping statistics ---5 packet(s) transmitted5 packet(s) received0.00% packet lossround-trip min/avg/max = 30/40/50 ms
