Segement Routing（SR）BE场景超详细实验解析

news2026/3/16 1:57:29

1.实验拓扑2.基础配置每一步在结果验证都有对应a.Domain的基础配置IGPIP地址NE1: # isis 1 is-level level-2 cost-style wide network-entity 10.0001.0000.0000.0001.00 # int g3/0/1 ip add 10.1.13.1 24 isis en 1 int g3/0/2 ip add 10.1.12.1 24 isis en 1 int l0 ip add 1.1.1.1 32 isis en 1 NE2: # isis 1 is-level level-2 cost-style wide network-entity 10.0001.0000.0000.0002.00 # int g3/0/0 ip add 10.1.12.2 24 isis en 1 int g3/0/1 ip add 10.1.24.2 24 isis en 1 int l0 ip add 2.2.2.2 32 isis en 1 NE3: # isis 1 is-level level-2 cost-style wide network-entity 10.0001.0000.0000.0003.00 # int g3/0/0 ip add 10.1.13.3 24 isis en 1 int g3/0/1 ip add 10.1.34.3 24 isis en 1 int l0 ip add 3.3.3.3 32 isis en 1 NE4: # isis 1 is-level level-2 cost-style wide network-entity 10.0001.0000.0000.0004.00 # int g3/0/1 ip add 10.1.34.4 24 isis en 1 int g3/0/2 ip add 10.1.24.4 24 isis en 1 int l0 ip add 4.4.4.4 32 isis en 1b.使能MPLS配置Segment Routing使能TI-LFA FRRNE1: mpls lsr 1.1.1.1 mpls segment-routing isis 1 segment-routing mpls segment-routing global-block 16000 23999 frr loop-free-alternate level-2 ti-lfa level-2 int l0 isis prefix-sid index 10 NE2: mpls lsr 2.2.2.2 mpls segment-routing isis 1 segment-routing mpls segment-routing global-block 16000 23999 frr loop-free-alternate level-2 ti-lfa level-2 int l0 isis prefix-sid index 20 NE3: mpls lsr 3.3.3.3 mpls segment-routing isis 1 segment-routing mpls segment-routing global-block 16000 23999 frr loop-free-alternate level-2 ti-lfa level-2 int l0 isis prefix-sid index 30 NE4: mpls lsr 4.4.4.4 mpls segment-routing isis 1 segment-routing mpls segment-routing global-block 16000 23999 frr loop-free-alternate level-2 ti-lfa level-2 int l0 isis prefix-sid index 40c.Site1和Domain之间EBGP邻居建立Site1: NE1: # ip vpn-instance a ipv4-family route-distinguisher 1:1 vpn-target 1:1 export-extcommunity vpn-target 1:1 import-extcommunity # interface GigabitEthernet3/0/0 ip binding vpn-instance a ip address 10.1.15.1 255.255.255.0 # bgp 300 router-id 1.1.1.1 peer 10.1.15.5 as-number 100 # ipv4-family vpn-instance a peer 10.1.15.5 as-number 100 # NE5: # interface GigabitEthernet3/0/0 undo shutdown ip address 10.1.15.5 255.255.255.0 # interface LoopBack0 ip address 5.5.5.5 255.255.255.255 # bgp 100 router-id 5.5.5.5 peer 10.1.15.1 as-number 300 # ipv4-family unicast undo synchronization network 5.5.5.5 255.255.255.255 peer 10.1.15.1 enable # Site2: NE4: # ip vpn-instance a ipv4-family route-distinguisher 1:2 vpn-target 1:1 export-extcommunity vpn-target 1:1 import-extcommunity # interface GigabitEthernet3/0/0 ip binding vpn-instance a ip address 10.1.46.4 255.255.255.0 # bgp 300 router-id 4.4.4.4 peer 10.1.46.6 as-number 200 # ipv4-family vpn-instance a peer 10.1.46.6 as-number 200 # NE6: # interface GigabitEthernet3/0/0 undo shutdown ip address 10.1.46.6 255.255.255.0 # interface LoopBack0 ip address 6.6.6.6 255.255.255.255 # # bgp 200 router-id 6.6.6.6 peer 10.1.46.4 as-number 300 # ipv4-family unicast undo synchronization network 6.6.6.6 255.255.255.255 peer 10.1.46.4 enable #d.Domain的PE之间MP-BGP建立NE1: bgp 300 router-id 1.1.1.1 peer 4.4.4.4 as-number 300 peer 4.4.4.4 connect-interface LoopBack0 # ipv4-family vpnv4 policy vpn-target peer 4.4.4.4 enable # NE4: bgp 300 router-id 4.4.4.4 peer 1.1.1.1 as-number 300 peer 1.1.1.1 connect-interface LoopBack0 # ipv4-family vpnv4 policy vpn-target peer 1.1.1.1 enable #3.结果验证a.ISIS邻居建立b.SR的隧道建立c.Site和Domain之间EBGP邻居建立d.Domain的PE之间MP-BGP邻居建立e.NE5和NE6是否ping通4.总结a.Segment Routing-BE和MPLS-BE的区别首先不需要再开启mpls ldp协议简化了控制平面不需要在接口开启mpls来传递标签而是通过IGP协议来传递标签简化控制平面b.TI-FRR LFA的作用可以让SR的拓扑一值有无环的备份路径前提是没有一些故障导致每一条路都不通c.转发方式先封装私网标签在封装公网SR标签

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