Segment Routing Agile Scrum Kanban —

SR Agile

Segment Routing Agile Scrum Kanban SR-MPLS SRv6 Traffic Engineering Network Automation CI/CD Ansible NAPALM Sprint Backlog Retrospective Production

SR Configuration

=== Segment Routing Configuration ===

Cisco IOS-XR — SR-MPLS

router isis CORE

address-family ipv4 unicast

segment-routing mpls

!

interface Loopback0

address-family ipv4 unicast

prefix-sid index 100

!

interface GigabitEthernet0/0/0/0

address-family ipv4 unicast

adjacency-sid absolute 15001

segment-routing

traffic-eng

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policy GOLD

color 100 end-point ipv4 10.0.0.5

candidate-paths

preference 100

explicit segment-list SL-GOLD

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index 10 mpls label 16002

index 20 mpls label 16005

Juniper — SRv6

set protocols isis source-packet-routing srv6

set protocols isis source-packet-routing node-segment ipv6-index 100

set protocols source-packet-routing srv6

locator LOC1 prefix 2001:db8:1::/48

Ansible Playbook for SR Deployment

• name: Deploy SR-MPLS Config

hosts: routers

gather_facts: no

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tasks:

• name: Configure Prefix-SID

ios_config:

lines:

• segment-routing mpls
• prefix-sid index {{ sr_index }}

parents:

• router isis CORE
• interface Loopback0
• address-family ipv4 unicast

from dataclasses import dataclass

@dataclass

class SRNode:

hostname: str

role: str

loopback: str

prefix_sid: int

adjacency_sids: str

flex_algo: str

nodes = [

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SRNode("PE1", "Provider Edge", "10.0.0.1", 16001, "24001-24004", "Algo 128 (low-latency)"),

SRNode("P1", "Core", "10.0.0.2", 16002, "24011-24014", "Algo 0 (SPF)"),

SRNode("P2", "Core", "10.0.0.3", 16003, "24021-24024", "Algo 0 (SPF)"),

SRNode("PE2", "Provider Edge", "10.0.0.4", 16004, "24031-24034", "Algo 128 (low-latency)"),

SRNode("PE3", "Provider Edge", "10.0.0.5", 16005, "24041-24044", "Algo 129 (low-jitter)"),

]

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Automation Pipeline

=== CI/CD for Network Config ===

GitLab CI Pipeline

stages:

• validate
• test
• deploy

validate:

stage: validate

script:

• python -m py_compile config_generator.py
• yamllint inventory/*.yml
• ansible-lint playbooks/*.yml

test:

stage: test

script:

• batfish-client validate configs/
• pytest tests/test_sr_config.py

deploy:

stage: deploy

script:

• ansible-playbook -i inventory/production playbooks/sr_deploy.yml

when: manual

only: [main]

@dataclass

class PipelineStage:

stage: str

tools: str

duration: str

gate: str

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rollback: str

stages = [

PipelineStage("Lint", "yamllint ansible-lint pylint", "30s", "Auto pass", "N/A"),

PipelineStage("Validate", "Batfish config analysis", "2 min", "No errors", "Block deploy"),

PipelineStage("Unit Test", "pytest mock routers", "1 min", "100% pass", "Block deploy"),

PipelineStage("Integration", "Lab routers GNS3/EVE-NG", "10 min", "Connectivity verified", "Block deploy"),

PipelineStage("Deploy Staging", "Ansible to staging", "5 min", "Health check pass", "Auto rollback"),

PipelineStage("Deploy Production", "Ansible to production", "15 min", "Manual approval + health", "Auto rollback"),

]

เคล็ดลับ

• Prefix-SID: กำหนด Prefix-SID Index ตาม Convention เช่น 1xxxx ต่อ Node
• TI-LFA: เปิด TI-LFA ทุก Interface สำหรับ Fast Reroute < 50ms
• Ansible: ใช้ Ansible สำหรับ Config ทุกครั้ง ไม่ Manual CLI
• Sprint: วางแผน Network Change เป็น Sprint 2 สัปดาห์
• Rollback: เตรียม Rollback Config ทุกครั้งก่อน Deploy

Segment Routing คืออะไร

Segment ID SID กำหนดเส้นทาง SR-MPLS Label SRv6 IPv6 ลดความซับซ้อน IGP OSPF IS-IS Traffic Engineering Flex-Algo TI-LFA Fast Reroute