上記の手順によりBGPの設定が出来たら、コマンドで設定状態を確認します。 コマンド：show ip bgp neighbors
Router2#show ip bgp neighbors
BGP neighbor is 192.168.10.1, remote AS 65001, external link >>ネイバーのIPアドレスとAS番号
BGP version 4, remote router ID 192.168.10.1
BGP state = Established, up for 00:01:38 >>状態が確認できる ※Establishedのため正常にBGP関係が確立できている
Last read 00:00:40, last write 00:00:43, hold time is 180, keepalive interval is 60 seconds
Neighbor sessions:
1 active, is not multisession capable (disabled)
Neighbor capabilities:
Route refresh: advertised and received(new)
Four-octets ASN Capability: advertised and received
Address family IPv4 Unicast: advertised and received
Enhanced Refresh Capability: advertised and received
Multisession Capability:
Stateful switchover support enabled: NO for session 1
Message statistics:
InQ depth is 0
OutQ depth is 0
Sent Rcvd
Opens: 1 1
Notifications: 0 0
Updates: 2 1
Keepalives: 3 3
Route Refresh: 0 0
Total: 6 5
Default minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast
Session: 192.168.10.1
BGP table version 2, neighbor version 2/0
Output queue size : 0
Index 1, Advertise bit 0
1 update-group member
Slow-peer detection is disabled
Slow-peer split-update-group dynamic is disabled
Sent Rcvd
Prefix activity: ---- ----
Prefixes Current: 1 0
Prefixes Total: 1 0
Implicit Withdraw: 0 0
Explicit Withdraw: 0 0
Used as bestpath: n/a 0
Used as multipath: n/a 0
Outbound Inbound
Local Policy Denied Prefixes: -------- -------
Total: 0 0
Number of NLRIs in the update sent: max 1, min 0
Last detected as dynamic slow peer: never
Dynamic slow peer recovered: never
Refresh Epoch: 1
Last Sent Refresh Start-of-rib: never
Last Sent Refresh End-of-rib: never
Last Received Refresh Start-of-rib: never
Last Received Refresh End-of-rib: never
Sent Rcvd
Refresh activity: ---- ----
Refresh Start-of-RIB 0 0
Refresh End-of-RIB 0 0
Address tracking is enabled, the RIB does have a route to 192.168.10.1
Connections established 1; dropped 0
Last reset never
Transport(tcp) path-mtu-discovery is enabled
Graceful-Restart is disabled
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Connection is ECN Disabled, Mininum incoming TTL 0, Outgoing TTL 1
Local host: 192.168.10.2, Local port: 26046
Foreign host: 192.168.10.1, Foreign port: 179
Connection tableid (VRF): 0
Maximum output segment queue size: 50
Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)
Event Timers (current time is 0x2120AC):
Timer Starts Wakeups Next
Retrans 5 0 0x0
TimeWait 0 0 0x0
AckHold 4 1 0x0
SendWnd 0 0 0x0
KeepAlive 0 0 0x0
GiveUp 0 0 0x0
PmtuAger 1 0 0x28C5D0
DeadWait 0 0 0x0
Linger 0 0 0x0
ProcessQ 0 0 0x0
iss: 920177443 snduna: 920177635 sndnxt: 920177635
irs: 20589617 rcvnxt: 20589755
sndwnd: 16193 scale: 0 maxrcvwnd: 16384
rcvwnd: 16247 scale: 0 delrcvwnd: 137
SRTT: 487 ms, RTTO: 3168 ms, RTV: 2681 ms, KRTT: 0 ms
minRTT: 0 ms, maxRTT: 1000 ms, ACK hold: 200 ms
Status Flags: active open
Option Flags: nagle, path mtu capable
IP Precedence value : 6
Datagrams (max data segment is 1460 bytes):
Rcvd: 9 (out of order: 0), with data: 5, total data bytes: 137
Sent: 10 (retransmit: 0, fastretransmit: 0, partialack: 0, Second Congestion: 0), with data: 5, total data bytes: 191
Packets received in fast path: 0, fast processed: 0, slow path: 0
fast lock acquisition failures: 0, slow path: 0
TCP Semaphore 0x0EBACB30 FREE
上記は[show ip bgp neighbors]の実行例です。
2行目の出力を参照すると、ネイバーのIPアドレスとAS番号が確認できます。 「BGP neighbor is 192.168.10.1, remote AS 65001, external link」
ネイバーから受信した経路情報を格納するBGPテーブルを確認します。 コマンド：show ip bgp
Router1#show ip bgp
BGP table version is 2, local router ID is 192.168.10.1
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
*> 192.168.20.0 192.168.10.2 0 0 65002 i
Router1#show 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, l - LISP
a - application route
+ - replicated route, % - next hop override
Gateway of last resort is not set
192.168.10.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.10.0/24 is directly connected, FastEthernet0
L 192.168.10.1/32 is directly connected, FastEthernet0
B 192.168.20.0/24 [20/0] via 192.168.10.2, 01:54:28
上記の結果より、 「B 192.168.20.0/24 [20/0] via 192.168.10.2, 01:54:28」の表示からBGPで経路を学習できていることが確認できます。
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