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邻居故障切换
BGP 邻居故障切换功能可在保持稳定的同时减少融合时间。启用故障切换时，BGP 会跟踪对等远程地址和对等本地地址的 IP 可
访问性。
当远程或对等本地地址无法访问时，BGP 会将会话与对等控制器断开。例如，如果对等 IPv6 目标/本地地址的路由表中不存在
活动路由，BGP 将使会话停止。
默认情况下，保留时间将监管 BGP 会话。按每个邻居或对等组配置 BGP 快速故障切换。BGP 路由器通常会携带大型路由表，
因为不需要频繁的会话重置。如果启用故障切换，则在添加的主机路由达到内部对等节点失败时与内部 BGP 对等节点的连接将
立即重置。
1. 在 ROUTER-BGP 模式下输入邻居 IP 地址。
neighbor ip-address
2. 在 ROUTER-NEIGHBOR 模式下禁用快速故障切换。
no fall-over
3. 在 ROUTER-BGP 模式下输入邻居 IP 地址。
neighbor ip-address
4. 在 ROUTER-NEIGHBOR 模式下启用 BGP 快速故障切换。
fall-over
配置邻居故障切换
OS10(config)# router bgp 100
OS10(config-router-bgp-100)# neighbor 3.1.1.1
OS10(config-router-neighbor)# remote-as 100
OS10(config-router-neighbor)# fall-over
OS10(config-router-neighbor)# no shutdown
验证邻居上的邻居故障切换
OS10(config-router-neighbor)# do show ip bgp neighbors 3.1.1.1
BGP neighbor is 3.1.1.1, remote AS 100, local AS 100 internal link
BGP version 4, remote router ID 3.3.3.33
BGP state ESTABLISHED, in this state for 00:17:17
Last read 00:27:54 seconds
Hold time is 180, keepalive interval is 60 seconds
Configured hold time is 180, keepalive interval is 60 seconds
Fall-over enabled
Received 23 messages
1 opens, 0 notifications, 1 updates
21 keepalives, 0 route refresh requests
Sent 21 messages
1 opens, 0 notifications, 0 updates
20 keepalives, 0 route refresh requests
Minimum time between advertisement runs is 30 seconds
Minimum time before advertisements start is 0 seconds
Capabilities received from neighbor for IPv4 Unicast:
MULTIPROTO_EXT(1)
ROUTE_REFRESH(2)
CISCO_ROUTE_REFRESH(128)
4_OCTET_AS(65)
Capabilities advertised to neighbor for IPv4 Unicast:
MULTIPROTO_EXT(1)
ROUTE_REFRESH(2)
CISCO_ROUTE_REFRESH(128)
4_OCTET_AS(65)
Prefixes accepted 3, Prefixes advertised 0
Connections established 1; dropped 0
Last reset never
For address family: IPv4 Unicast
Allow local AS number 0 times in AS-PATH attribute
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