EIGRP
·
IGP Migration: Moving from EIGRP to OSPF Without an Outage
Sooner or later somebody decides the network is moving from EIGRP to OSPF. Maybe a merger brought in a multi-
IP Routing
The routing half of the CCNP and CCIE blueprints. Articles tagged IP Routing cover static and dynamic routing, redistribution, policy routing and route manipulation on Cisco IOS XE.
Latest
EIGRP
·
Multi-Protocol Redistribution: The CCIE Scenarios That Break Networks
Redistribution between two routing protocols at a single point is easy. Redistribution between two routing protocols at two points is
Object Tracking and Reliable Static Routes with IP SLA
A static route has one fatal flaw: it believes in itself. As long as the outgoing interface is up, the
Troubleshooting Route Redistribution: Missing, Looping, and Suboptimal Routes
Redistribution fails three ways: routes that never arrive, routes that echo back and loop, and routes that arrive but take the long way. All three captured on CML with IOS XE 17.18.2, including the EIGRP external at AD 170 that loses to OSPF's 110 while the shorter direct path sits unused in the...
OSPFv3 Configuration on Cisco IOS XE
This is the hands-on half of our OSPFv3 coverage: a complete dual-stack configuration on Cisco IOS XE, from
OSPFv3 Explained: OSPF for IPv6 (and Address Families for IPv4)
OSPFv3 is not "OSPF with longer addresses". It is a redesign of the protocol machinery that happens to
BFD: Sub-Second Failure Detection for OSPF, EIGRP, and BGP
Routing protocols detect dead neighbors with hello timers measured in tens of seconds. Modern applications notice outages measured in hundreds
VRF-Lite on Cisco IOS XE: Configuration and Verification
One router, multiple routing tables. That is the entire idea behind VRF (Virtual Routing and Forwarding), and it is the
Policy-Based Routing (PBR): Configuration and Verification
Routing protocols answer one question: what is the best path to this destination? Policy-based routing (PBR) exists for every
Redistribution Loop Prevention: Route Tags, AD, and Filtering
Two-point redistribution is where redistribution stops being a config exercise and starts being a design problem. The moment two
Route Redistribution on Cisco IOS XE: The Complete Multi-Protocol Guide
Most networks do not run one routing protocol. Mergers bolt an EIGRP shop onto an OSPF backbone, a campus hands
Static Routing on Cisco IOS XE: Default, Floating, and Host Routes
Static routing is the first routing you ever configure and the last routing you stop using. Dynamic protocols get the