JUNOS_BGP1
BGPをいちから復習
構成は↓
R1・・・AS１
R2、R3・・・AS2
便宜上、R1,R2,R3の全てのIFで、OSPFを有効化
まずは、Ciscoでやってみる。
R1
router bgp 1
bgp log-neighbor-changes
bgp router-id 1.1.1.1
neighbor 10.1.1.254 remote-as 2
!
address-family ipv4
neighbor 10.1.1.254 activate
exit-address-family
R2
router bgp 2
bgp log-neighbor-changes
bgp router-id 2.2.2.2
neighbor 10.1.1.1 remote-as 1
neighbor 10.1.2.254 remote-as 2
!
address-family ipv4
neighbor 10.1.1.1 activate
neighbor 10.1.2.254 activate
exit-address-family
!
R3
router bgp 2
bgp log-neighbor-changes
bgp router-id 3.3.3.3
neighbor 10.1.2.1 remote-as 2
!
address-family ipv4
neighbor 10.1.2.1 activate
exit-address-family
!
R2で確認
R2#show bgp ipv4 unicast summary
BGP router identifier 2.2.2.2, local AS number 2
BGP table version is 1, main routing table version 1Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
10.1.1.1 4 1 14 14 1 0 0 00:09:40 0
10.1.2.254 4 2 13 13 1 0 0 00:08:53 0
今度はeBGP/iBGPのneighborをLoopback で指定してみる。
R1
router bgp 1
bgp router-id 1.1.1.1
bgp log-neighbor-changes
neighbor 2.2.2.2 remote-as 2
!
address-family ipv4
neighbor 2.2.2.2 activate
exit-address-family
R2
router bgp 2
bgp router-id 2.2.2.2
bgp log-neighbor-changes
neighbor 1.1.1.1 remote-as 1
neighbor 3.3.3.3 remote-as 3
!
address-family ipv4
neighbor 1.1.1.1 activate
neighbor 3.3.3.3 activate
exit-address-family
R3
router bgp 2
bgp router-id 3.3.3.3
bgp log-neighbor-changes
neighbor 2.2.2.2 remote-as 2
!
address-family ipv4
neighbor 2.2.2.2 activate
exit-address-family
R2で確認
R2#show bgp ipv4 unicast summary
BGP router identifier 2.2.2.2, local AS number 2
BGP table version is 1, main routing table version 1Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
1.1.1.1 4 1 0 0 1 0 0 never Idle
3.3.3.3 4 3 0 0 1 0 0 never Idle
Loopbackにすると、Idle状態のまま
修正後
R1
router bgp 1
bgp router-id 1.1.1.1
bgp log-neighbor-changes
neighbor 2.2.2.2 remote-as 2
neighbor 2.2.2.2 ebgp-multihop 10
neighbor 2.2.2.2 update-source Loopback0
!
address-family ipv4
neighbor 2.2.2.2 activate
exit-address-family
R2
router bgp 2
bgp router-id 2.2.2.2
bgp log-neighbor-changes
neighbor 1.1.1.1 remote-as 1
neighbor 1.1.1.1 ebgp-multihop 10
neighbor 1.1.1.1 update-source Loopback0
neighbor 3.3.3.3 remote-as 2
neighbor 3.3.3.3 update-source Loopback0
!
address-family ipv4
neighbor 1.1.1.1 activate
neighbor 3.3.3.3 activate
exit-address-family
R3
router bgp 2
bgp router-id 3.3.3.3
bgp log-neighbor-changes
neighbor 2.2.2.2 remote-as 2
neighbor 2.2.2.2 update-source Loopback0
!
address-family ipv4
neighbor 2.2.2.2 activate
exit-address-family
!
赤字・・・eBGPでLoopbackでネイバー張る時の設定
青地・・・iBGPでLoopbackでネイバー張る時の設定
R2で確認
R2#show bgp ipv4 unicast summary
BGP router identifier 2.2.2.2, local AS number 2
BGP table version is 1, main routing table version 1Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
1.1.1.1 4 1 7 7 1 0 0 00:03:02 0
3.3.3.3 4 2 8 7 1 0 0 00:04:28 0
R2#
本題はこれから・・・
今の流れをJUNOSでやってみる
R1
set routing-options router-id 1.1.1.1
set routing-options autonomous-system 1
set protocols bgp group EBGP type external
set protocols bgp group EBGP peer-as 2
set protocols bgp group EBGP neighbor 10.1.1.254
R2
set routing-options router-id 2.2.2.2
set routing-options autonomous-system 2
set protocols bgp group EBGP type external
set protocols bgp group EBGP peer-as 1
set protocols bgp group EBGP neighbor 10.1.1.1
set protocols bgp group IBGP type internal
set protocols bgp group IBGP peer-as 2
set protocols bgp group IBGP neighbor 10.1.2.254
R3
set routing-options router-id 3.3.3.3
set routing-options autonomous-system 2
set protocols bgp group IBGP type internal
set protocols bgp group IBGP peer-as 2
set protocols bgp group IBGP neighbor 10.1.2.1
R2で確認
admin@R2# run show bgp summary
Groups: 2 Peers: 2 Down peers: 0
Table Tot Paths Act Paths Suppressed History Damp State Pending
inet.0
0 0 0 0 0 0
Peer AS InPkt OutPkt OutQ Flaps Last Up/Dwn State|#Active/Received/Accepted/Damped...
10.1.1.1 1 3 3 0 0 49 0/0/0/0 0/0/0/0
10.1.2.254 2 9 7 0 1 2:49 0/0/0/0 0/0/0/0
ネイバーをLoopbackに変えてみる
R1
set routing-options router-id 1.1.1.1
set routing-options autonomous-system 1
set protocols bgp group EBGP type external
set protocols bgp group EBGP local-address 1.1.1.1
set protocols bgp group EBGP peer-as 2
set protocols bgp group EBGP neighbor 2.2.2.2 multihop ttl 10
R2
set routing-options router-id 2.2.2.2
set routing-options autonomous-system 2
set protocols bgp group EBGP type external
set protocols bgp group EBGP multihop ttl 10
set protocols bgp group EBGP local-address 2.2.2.2
set protocols bgp group EBGP peer-as 1
set protocols bgp group EBGP neighbor 1.1.1.1
set protocols bgp group IBGP type internal
set protocols bgp group IBGP local-address 2.2.2.2
set protocols bgp group IBGP peer-as 2
set protocols bgp group IBGP neighbor 3.3.3.3
R3
set routing-options router-id 3.3.3.3
set routing-options autonomous-system 2
set protocols bgp group IBGP type internal
set protocols bgp group IBGP local-address 3.3.3.3
set protocols bgp group IBGP peer-as 2
set protocols bgp group IBGP neighbor 2.2.2.2
R2で確認
admin@R2# run show bgp summary
Groups: 2 Peers: 2 Down peers: 0
Table Tot Paths Act Paths Suppressed History Damp State Pending
inet.0
0 0 0 0 0 0
Peer AS InPkt OutPkt OutQ Flaps Last Up/Dwn State|#Active/Received/Accepted/Damped...
1.1.1.1 1 9 8 0 0 3:26 0/0/0/0 0/0/0/0
3.3.3.3 2 16 15 0 1 6:05 0/0/0/0 0/0/0/0
無駄にCiscoでの確認を長くしてしまい、JUNOSでの確認をするのを忘れてた・・・
