SR MPLS TE隧道配置实战指南

SR MPLS TE隧道配置案例详解

场景描述

某企业核心网络需要构建高可靠性、低延迟的SR MPLS TE隧道，用于承载关键业务流量。网络拓扑包含多台支持Segment Routing的骨干路由器，要求基于显式路径实现流量工程，并支持快速重路由（FRR）。

基础配置准备

确保所有节点启用MPLS和IS-IS/BGP协议，并支持Segment Routing扩展。全局启用MPLS和SR功能：

mpls traffic-eng tunnels  
segment-routing mpls

配置SR Policy与显式路径

定义SR Policy并指定SID列表，以下为Cisco IOS XR示例：

segment-routing  
 traffic-eng  
  policy POLICY_1  
   color 100 end-point ipv4 192.168.1.2  
   candidate-paths  
    preference 100  
     explicit segment-list PATH_1

显式路径通过SID列表定义，需提前规划节点/邻接标签：

segment-routing  
 traffic-eng  
  segment-list PATH_1  
   index 10 mpls label 16002  
   index 20 mpls label 16003

隧道接口绑定与流量引导

创建隧道接口并绑定SR Policy，指定源目地址：

interface tunnel-te1  
 ipv4 unnumbered Loopback0  
 destination 192.168.1.2  
 path-option 1 explicit name PATH_1 segment-routing

通过路由策略将流量引入隧道：

route-policy TRAFFIC_ENGINEERING  
  set mpls traffic-eng tunnel 1

验证与故障排查

检查隧道状态和路径有效性：

show mpls traffic-eng tunnels  
show segment-routing traffic-eng policy

使用Ping/Traceroute验证数据平面：

ping mpls traffic-eng tunnel-te 1

关键优化措施

FRR保护：在IS-IS中启用TI-LFA（Topology-Independent LFA），自动计算备份路径。
动态路径调整：结合BGP-LS收集拓扑信息，通过PCE实现动态路径优化。
QoS策略：在隧道接口应用优先级队列，确保关键业务低延迟。

通过上述步骤可完成SR MPLS TE隧道的端到端部署，实现灵活、高效的流量调度。实际配置需根据厂商设备（如华为/Juniper）调整语法，但核心逻辑保持一致。

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