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ESR2# sh bgp summary
2025-11-26 06:37:55
BGP router identifier 198.51.100.2, local AS number 64497, AS confederation identifier 69 <----
BGP activity 1/0 prefixes
Neighbor AS MsgRcvd MsgSent Up/Down St/PfxRcd
(d,h:m:s)
---------------------- ------------- ---------- ---------- ---------- ------------
203.0.113.2 64496 9 10 00,00:03:07 1
ESR3# sh bgp summary
2025-11-26 06:38:52
BGP router identifier 192.0.2.2, local AS number 64496, AS confederation identifier 69 <---
BGP activity 0/1 prefixes
Neighbor AS MsgRcvd MsgSent Up/Down St/PfxRcd
(d,h:m:s)
---------------------- ------------- ---------- ---------- ---------- ------------
203.0.113.1 64497 7 10 00,00:04:03 0 |
BGP-сессия перешла в состояние "Established". Необходимо убедиться, что тип сессии соответствует "confed-external". Для eBGP-cессии автоматически увеличится multi-hop до 255:
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ESR3# sh bgp neighbors
BGP neighbor is 203.0.113.1
BGP state: Established
Type: Static neighbor
Neighbor address: 203.0.113.1
Neighbor AS: 64497
Neighbor ID: 198.51.100.2
Neighbor caps: refresh enhanced-refresh restart-aware AS4
Session: confed-external multihop AS4 <-----
Source address: 203.0.113.2
Weight: 0
Hold timer: 120/180
Keepalive timer: 18/60
EBGP multi-hop: 255 <-----
RR client: No
Address family ipv4 unicast:
Send-label: No
Default originate: No
Default information originate: No
Preference: 170
Remove private AS: No
Next-hop self: No
Next-hop unchanged: No
Uptime (d,h:m:s): 00,00:02:09
ESR2# sh bgp neighbors
BGP neighbor is 203.0.113.2
BGP state: Established
Type: Static neighbor
Neighbor address: 203.0.113.2
Neighbor AS: 64496
Neighbor ID: 192.0.2.2
Neighbor caps: refresh enhanced-refresh restart-aware AS4
Session: confed-external multihop AS4 <-----
Source address: 203.0.113.1
Weight: 0
Hold timer: 140/180
Keepalive timer: 38/60
EBGP multi-hop: 255 <----
RR client: No
Address family ipv4 unicast:
Send-label: No
Default originate: No
Default information originate: No
Preference: 170
Remove private AS: No
Next-hop self: No
Next-hop unchanged: No
Uptime (d,h:m:s): 00,00:08:05
|
Проверим, что ESR2 принимает анонсируемый ESR3 маршрут 192.0.2.2/32:
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ESR2(config)# route-map OUT
ESR2(config-route-map)# rule 1
ESR2(config-route-map-rule)# match ip address 192.0.2.2/32
ESR2(config-route-map-rule)# exit
ESR2(config-route-map)# rule 2
ESR2(config-route-map-rule)# action deny
ESR2(config-route-map-rule)# exit
ESR2(config-route-map)# exit
ESR2(config)#
ESR2(config)# router bgp 64497
ESR2(config-bgp)# neighbor 198.51.100.1
ESR2(config-bgp-neighbor)# remote-as 64498
ESR2(config-bgp-neighbor)# address-family ipv4 unicast
ESR2(config-bgp-neighbor-af)# route-map OUT out
ESR2(config-bgp-neighbor-af)# enable
ESR2(config-bgp-neighbor-af)# exit
ESR2(config-bgp-neighbor)# enable
ESR2(config-bgp-neighbor)# exit
ESR2(config-bgp)# neighbor 203.0.113.2
ESR2(config-bgp-neighbor)# address-family ipv4 unicast
ESR2(config-bgp-neighbor-af)# next-hop-self
ESR2(config-bgp-neighbor-af)# exit
ESR2(config-bgp-neighbor)# do com
ESR2(config-bgp)# do com
ESR2(config-bgp)# do conf |
Проверяем, что пиринг поднялся:
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ESR2# sh bgp neighbors 198.51.100.1
BGP neighbor is 198.51.100.1
BGP state: Established
Type: Static neighbor
Neighbor address: 198.51.100.1
Neighbor AS: 64498
Neighbor ID: 192.0.2.1
Neighbor caps: refresh enhanced-refresh restart-aware AS4
Session: external AS4
Source address: 198.51.100.2
Weight: 0
Hold timer: 136/180
Keepalive timer: 36/60
RR client: No
Address family ipv4 unicast:
Send-label: No
Default originate: No
Default information originate: No
Outgoing route-map: OUT
Preference: 170
Remove private AS: No
Next-hop self: No
Next-hop unchanged: No
Uptime (d,h:m:s): 00,00:16:04
ESR1# sh bgp neighbors 198.51.100.2
BGP neighbor is 198.51.100.2
BGP state: Established
Type: Static neighbor
Neighbor address: 198.51.100.2
Neighbor AS: 69
Neighbor ID: 198.51.100.2
Neighbor caps: refresh enhanced-refresh restart-aware AS4
Session: external AS4
Source address: 198.51.100.1
Weight: 0
Hold timer: 135/180
Keepalive timer: 39/60
RR client: No
Address family ipv4 unicast:
Send-label: No
Default originate: No
Default information originate: No
Outgoing route-map: OUT
Preference: 170
Remove private AS: No
Next-hop self: No
Next-hop unchanged: No
Uptime (d,h:m:s): 00,00:34:20 |
Проверяем корректность анонсируемой информации:
...
