Segment Routing Troubleshooting แก้ปัญหา — วิเคราะห์และแก้ไข SR Network

Segment Routing

Segment Routing Troubleshooting SR-MPLS SRv6 ISIS OSPF Traffic Engineering Prefix SID Adjacency SID SRGB Label Policy Fast Reroute Service Chaining

SR-MPLS Troubleshooting

=== SR-MPLS Troubleshooting Commands ===

Step 1: Check IGP Adjacency

show isis neighbors

show ospf neighbor

show isis database detail

show isis segment-routing

Step 2: Verify SRGB (Segment Routing Global Block)

show segment-routing mpls state

show isis segment-routing global-block

! Default SRGB: 16000-23999

! All routers in domain MUST have same SRGB

Step 3: Check Prefix SID

show isis segment-routing prefix-sid-map

show isis route detail

! Verify Prefix SID is unique per prefix

! No SID conflicts across the network

Step 4: Verify Label Forwarding

show mpls forwarding-table

show mpls forwarding-table labels 16001

! Check SWAP/PUSH/POP actions

Step 5: Check SR Policy

show segment-routing traffic-eng policy all

show segment-routing traffic-eng policy name SR-POLICY-1

เนื้อหาเกี่ยวข้อง — แนะนำให้อ่าน ข่าวเหรียญ shiba วันนี้

show segment-routing traffic-eng forwarding

Step 6: End-to-end Verification

traceroute mpls segment-routing 10.0.0.1/32

ping mpls segment-routing 10.0.0.1/32

traceroute sr-mpls 16001 16002 16003

IOS-XR Configuration

router isis CORE

แนะนำเพิ่มเติม — คอร์สเทรด Forex ที่ iCafeForex

address-family ipv4 unicast

segment-routing mpls

interface Loopback0

address-family ipv4 unicast

prefix-sid index 1

interface GigabitEthernet0/0/0/0

address-family ipv4 unicast

metric 10

segment-routing

global-block 16000 23999

from dataclasses import dataclass

@dataclass

class SRIssue:

issue: str

symptom: str

cause: str

command: str

เนื้อหาเกี่ยวข้อง — Snyk Code Security Zero Downtime Deployment —

fix: str

issues = [

SRIssue("No Prefix SID", "Label not in forwarding table", "SID not configured on Loopback", "show isis segment-routing prefix-sid", "Configure prefix-sid index under Loopback"),

SRIssue("SRGB Mismatch", "Label collision wrong forwarding", "Different SRGB on routers", "show segment-routing mpls state", "Align SRGB on all routers"),

SRIssue("SID Conflict", "Duplicate SID two prefixes", "Same SID index on different routers", "show isis segment-routing prefix-sid-map", "Assign unique SID per prefix"),

SRIssue("IGP Not Converged", "SR labels not learned", "ISIS/OSPF adjacency down", "show isis neighbors", "Fix IGP adjacency first"),

SRIssue("SR Policy Down", "Traffic not following TE path", "Segment list invalid or next-hop unreachable", "show sr traffic-eng policy", "Fix segment list or path"),

]

แนะนำเพิ่มเติม — อ่านเพิ่มเติมที่ SiamCafeBook

SRv6 Troubleshooting

=== SRv6 Troubleshooting ===

SRv6 Locator and SID

show segment-routing srv6 sid

show segment-routing srv6 locator

show segment-routing srv6 manager

SRv6 Configuration

segment-routing

srv6

locators

เนื้อหาเกี่ยวข้อง — บทความที่เกี่ยวข้อง: TensorRT Optimization กับ DevSecOps Integration

locator MAIN

micro-segment behavior unode psp-usd

prefix fc00:0:1::/48

SRv6 Functions

fc00:0:1:: — End (endpoint)

fc00:0:1:1:: — End.X (L3 cross-connect)

fc00:0:1:40:: — End.DT4 (decap to IPv4 VRF)

fc00:0:1:60:: — End.DT6 (decap to IPv6 VRF)

Verify SRv6 forwarding

show cef ipv6 fc00:0:1::/48

show route ipv6 fc00:0:1::/48

traceroute ipv6 fc00:0:2::1 source fc00:0:1::1

SRv6 VPN (L3VPN over SRv6)

vrf CUSTOMER-A

address-family ipv4 unicast

import route-target 100:1

export route-target 100:1

router bgp 65000

vrf CUSTOMER-A

address-family ipv4 unicast

segment-routing srv6

locator MAIN

alloc mode per-vrf

เนื้อหาเกี่ยวข้อง — Prometheus Federation RBAC ABAC Policy — คู่มือฉบับสมบูรณ์ 2026

@dataclass

class SRv6Function:

function_name: str

behavior: str

use_case: str

sid_example: str

functions = [

SRv6Function("End", "Endpoint SRH processing", "Transit node", "fc00:0:1::"),

SRv6Function("End.X", "L3 cross-connect to next-hop", "Adjacency SID", "fc00:0:1:1::"),

SRv6Function("End.DT4", "Decap and lookup IPv4 VRF", "L3VPN PE", "fc00:0:1:40::"),

SRv6Function("End.DT6", "Decap and lookup IPv6 VRF", "L3VPN PE IPv6", "fc00:0:1:60::"),

SRv6Function("End.DX4", "Decap and forward IPv4", "Per-CE VPN", "fc00:0:1:41::"),

SRv6Function("End.B6.Encaps", "Encap with new SRH", "TE Policy binding", "fc00:0:1:b6::"),

SRv6Function("H.Encaps", "Headend encap SRH", "SR Policy headend", "N/A (headend)"),

]

เคล็ดลับ

• SRGB: ตรวจ SRGB ทุก Router ต้องตรงกัน ก่อน Troubleshoot อื่น
• Unique SID: ทุก Prefix SID ต้อง Unique ทั้ง Domain
• IGP First: แก้ IGP Adjacency ก่อน แล้ว SR จะตามมา
• Traceroute: ใช้ traceroute mpls sr ตรวจ Label Path
• Flex-Algo: ใช้ Flex-Algo สำหรับ Multiple Topology ง่ายกว่า TE Policy

Segment Routing คืออะไร

Network Architecture Segment SID Label SR-MPLS SRv6 IGP ISIS OSPF ไม่ต้อง LDP RSVP-TE Traffic Engineering Fast Reroute Service Chaining

สรุป

Segment Routing Troubleshooting SR-MPLS SRv6 ISIS OSPF SRGB Prefix SID Label Traffic Engineering Flex-Algo SR Policy Fast Reroute Production Network