H3C BGP配置11- BGP网络的可靠性典型配置举例3-BGP快速重路由配置
作者:互联网
1.组网需求
Switch A、Switch B、Switch C和Switch D通过BGP协议实现网络互连。要求链路B正常时,Switch A和Switch D之间的流量通过链路B转发;链路B出现故障时,流量可以快速切换到链路A上。
2.配置步骤
1)在AS 200内配置OSPF,发布接口地址所在网段的路由(包括Loopback接口),确保Switch B、Switch C和Switch D之间路由可达(略)
2) 配置BGP连接
# 配置Switch A分别与Switch B和Switch C建立EBGP会话,并配置通过BGP发布路由1.1.1.1/32。 [SwitchA] bgp 100 [SwitchA-bgp-default] router-id 1.1.1.1 [SwitchA-bgp-default] peer 10.1.1.2 as-number 200 [SwitchA-bgp-default] peer 30.1.1.3 as-number 200 [SwitchA-bgp-default] address-family ipv4 unicast [SwitchA-bgp-default-ipv4] peer 10.1.1.2 enable [SwitchA-bgp-default-ipv4] peer 30.1.1.3 enable [SwitchA-bgp-default-ipv4] network 1.1.1.1 32
# 配置Switch B与Switch A建立EBGP会话,与Switch D建立IBGP会话。 [SwitchB] bgp 200 [SwitchB-bgp-default] router-id 2.2.2.2 [SwitchB-bgp-default] peer 10.1.1.1 as-number 100 [SwitchB-bgp-default] peer 4.4.4.4 as-number 200 [SwitchB-bgp-default] peer 4.4.4.4 connect-interface loopback 0 [SwitchB-bgp-default] address-family ipv4 unicast [SwitchB-bgp-default-ipv4] peer 10.1.1.1 enable [SwitchB-bgp-default-ipv4] peer 4.4.4.4 enable [SwitchB-bgp-default-ipv4] peer 4.4.4.4 next-hop-local
# 配置Switch C与Switch A建立EBGP会话,与Switch D建立IBGP会话。 [SwitchC] bgp 200 [SwitchC-bgp-default] router-id 3.3.3.3 [SwitchC-bgp-default] peer 30.1.1.1 as-number 100 [SwitchC-bgp-default] peer 4.4.4.4 as-number 200 [SwitchC-bgp-default] peer 4.4.4.4 connect-interface loopback 0 [SwitchC-bgp-default] address-family ipv4 unicast [SwitchC-bgp-default-ipv4] peer 30.1.1.1 enable [SwitchC-bgp-default-ipv4] peer 4.4.4.4 enable [SwitchC-bgp-default-ipv4] peer 4.4.4.4 next-hop-local
# 配置Switch D分别与Switch B和Switch C建立IBGP会话,并配置BGP发布路由4.4.4.4/32。 [SwitchD] bgp 200 [SwitchD-bgp-default] router-id 4.4.4.4 [SwitchD-bgp-default] peer 2.2.2.2 as-number 200 [SwitchD-bgp-default] peer 2.2.2.2 connect-interface loopback 0 [SwitchD-bgp-default] peer 3.3.3.3 as-number 200 [SwitchD-bgp-default] peer 3.3.3.3 connect-interface loopback 0 [SwitchD-bgp-default] address-family ipv4 unicast [SwitchD-bgp-default-ipv4] peer 2.2.2.2 enable [SwitchD-bgp-default-ipv4] peer 3.3.3.3 enable [SwitchD-bgp-default-ipv4] network 4.4.4.4 32
3)修改路由的首选值,使得Switch A和Switch D之间的流量优先通过链路B转发
# 在Switch A上配置从Switch B接收到的路由的首选值为100。 [SwitchA-bgp-default-ipv4] peer 10.1.1.2 preferred-value 100 # 在Switch D上配置从Switch B接收到的路由的首选值为100。 [SwitchD-bgp-default-ipv4] peer 2.2.2.2 preferred-value 100
4) 配置BGP快速重路由
# 配置Switch A:配置通过Echo方式的BFD会话检测主路由的下一跳是否可达,并配置BFD echo报文的源IP地址为11.1.1.1;创建路由策略frr,为路由4.4.4.4/32指定备份下一跳的地址为30.1.1.3(对等体Switch C的地址);在BGP IPv4单播地址族下应用该路由策略。 [SwitchA] bfd echo-source-ip 11.1.1.1 [SwitchA] ip prefix-list abc index 10 permit 4.4.4.4 32 [SwitchA] route-policy frr permit node 10 [SwitchA-route-policy] if-match ip address prefix-list abc [SwitchA-route-policy] apply fast-reroute backup-nexthop 30.1.1.3 [SwitchA-route-policy] quit [SwitchA] bgp 100 [SwitchA-bgp-default] primary-path-detect bfd echo [SwitchA-bgp-default] address-family ipv4 unicast [SwitchA-bgp-default-ipv4] fast-reroute route-policy frr
# 配置Switch D:配置通过Echo方式的BFD会话检测主路由的下一跳是否可达,并配置BFD echo报文的源IP地址为44.1.1.1;创建路由策略frr,为路由1.1.1.1/32指定备份下一跳的地址为3.3.3.3(对等体Switch C的地址);在BGP IPv4单播地址族下应用该路由策略。 [SwitchD] bfd echo-source-ip 44.1.1.1 [SwitchD] ip prefix-list abc index 10 permit 1.1.1.1 32 [SwitchD] route-policy frr permit node 10 [SwitchD-route-policy] if-match ip address prefix-list abc [SwitchD-route-policy] apply fast-reroute backup-nexthop 3.3.3.3 [SwitchD-route-policy] quit [SwitchD] bgp 200 [SwitchD-bgp-default] primary-path-detect bfd echo [SwitchD-bgp-default] address-family ipv4 unicast [SwitchD-bgp-default-ipv4] fast-reroute route-policy frr
3.验证配置
# 在Switch A上查看4.4.4.4/32路由,可以看到备份下一跳信息。 [SwitchA] display ip routing-table 4.4.4.4 32 verbose Summary count : 1 Destination: 4.4.4.4/32 Protocol: BGP Process ID: 0 SubProtID: 0x2 Age: 00h01m52s Cost: 0 Preference: 255 IpPre: N/A QosLocalID: N/A Tag: 0 State: Active Adv OrigTblID: 0x0 OrigVrf: default-vrf TableID: 0x2 OrigAs: 200 NibID: 0x15000003 LastAs: 200 AttrID: 0x5 Neighbor: 10.1.1.2 Flags: 0x10060 OrigNextHop: 10.1.1.2 Label: NULL RealNextHop: 10.1.1.2 BkLabel: NULL BkNextHop: 30.1.1.3 SRLabel: NULL BkSRLabel: NULL SIDIndex: NULL InLabel: NULL Tunnel ID: Invalid Interface: Vlan-interface 100 BkTunnel ID: Invalid BkInterface: Vlan-interface 200 FtnIndex: 0x0 TrafficIndex: N/A Connector: N/A PathID: 0x0 LinkCost: 0 MicroSegID: 0
# 在Switch D上查看1.1.1.1/32路由,可以看到备份下一跳信息。 [SwitchD] display ip routing-table 1.1.1.1 32 verbose Summary count : 1 Destination: 1.1.1.1/32 Protocol: BGP Process ID: 0 SubProtID: 0x1 Age: 00h00m36s Cost: 0 Preference: 255 IpPre: N/A QosLocalID: N/A Tag: 0 State: Active Adv OrigTblID: 0x0 OrigVrf: default-vrf TableID: 0x2 OrigAs: 100 NibID: 0x15000003 LastAs: 100 AttrID: 0x1 Neighbor: 2.2.2.2 Flags: 0x10060 OrigNextHop: 2.2.2.2 Label: NULL RealNextHop: 20.1.1.2 BkLabel: NULL BkNextHop: 40.1.1.3 SRLabel: NULL BkSRLabel: NULL SIDIndex: NULL InLabel: NULL Tunnel ID: Invalid Interface: Vlan-interface 101 BkTunnel ID: Invalid BkInterface: Vlan-interface 201 FtnIndex: 0x0 TrafficIndex: N/A Connector: N/A PathID: 0x0 LinkCost: 0 MicroSegID: 0
标签:11,bgp,1.1,4.4,default,配置,BGP,Switch,peer 来源: https://www.cnblogs.com/xinghen1216/p/15801355.html