routing 归档 - 夜莺博客

标签：routing

Cisco IP SLA Tracking for Floating Static Route Failover

Cisco IP SLA Tracking for Floating Static Route Failover

Build ISP failover with Cisco IP SLA: icmp-echo probes, track objects, floating static routes with distance and NAT failover using route-maps.

admin admin 2026-10-08
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BGP Next-Hop Self and Third-Party Next Hop

BGP Next-Hop Self and Third-Party Next Hop

Why iBGP preserves the next hop, when next-hop-self is required, how the third-party next-hop rule saves you, and how to diagnose a route that is pres

admin admin 2026-10-07
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OSPF External Metrics: E1 vs E2 Explained

OSPF External Metrics: E1 vs E2 Explained

Why redistributed OSPF routes show up as E2 with a flat metric of 20, when to switch to E1, and how the type-5 LSA forward address decides which ASBR

admin admin 2026-10-07
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OSPF Network Types: Broadcast, NBMA and Point-to-Point

OSPF Network Types: Broadcast, NBMA and Point-to-Point

How OSPF broadcast, non-broadcast, point-to-point and point-to-multipoint network types differ in DR election, timers and neighbor discovery - with in

admin admin 2026-10-07
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BGP Route Aggregation: summary-only and suppress-map

BGP Route Aggregation: summary-only and suppress-map

How BGP aggregate-address works with summary-only, as-set, suppress-map and suppress-map exceptions - and the AS_PATH loop traps that make aggregation

admin admin 2026-10-07
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BGP Soft Reconfiguration vs Route Refresh

BGP Soft Reconfiguration vs Route Refresh

Compare BGP soft-reconfiguration inbound with the RFC 2918 route-refresh capability, the memory each costs, and how to re-apply inbound policy without

admin admin 2026-10-07
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Junos Logical Systems and Virtual Routers Explained

Junos Logical Systems and Virtual Routers Explained

Compare Junos logical systems, tenant systems, virtual-router instances and VRF-Lite, with CLI examples for partitioning one device between tenants.

admin admin 2026-10-06
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Paris Traceroute: Finding Paths in ECMP Networks

Paris Traceroute: Finding Paths in ECMP Networks

Classic traceroute lies in load-balanced networks. Use Paris traceroute for consistent flow-based paths, and multipath discovery to enumerate every EC

admin admin 2026-10-06
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BGP 4-Byte ASN Migration: AS_TRANS and Interop

BGP 4-Byte ASN Migration: AS_TRANS and Interop

Migrate BGP networks to 4-byte AS numbers safely: AS_TRANS 23456 behaviour, capability negotiation, dual-AS peering and a step-by-step upgrade order.

admin admin 2026-10-06
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VPLS and Pseudowire L2VPN Configuration Guide

VPLS and Pseudowire L2VPN Configuration Guide

Understand VPLS, VPWS and point-to-point pseudowires: the LDP and BGP signalling options, MTU and VLAN handling, and the config and verification comma

admin admin 2026-10-05
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