EIGRP, RIP and IS-IS
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Cisco IOS25
show ip eigrp neighbors- Lists EIGRP neighbors with interface, hold time, uptime, SRTT, RTO and queue count. A Q Cnt that stays above 0 means a neighbor is not acknowledging.
show ip eigrp neighbors detail- Adds per-neighbor detail such as retransmissions, prefixes received, and whether the peer is a stub and which routes it advertises.
Example
Output show ip eigrp neighbors detail | include Stub|Suppressing show ip eigrp topology- Shows successors and feasible successors per prefix, with the FD and each path's (metric/reported distance).
show ip eigrp topology all-links- Shows every path in the topology table, including neighbors that fail the feasibility condition and are hidden from the default output.
show ip eigrp topology 10.50.0.0/24- Shows one prefix in full, with minimum bandwidth, total delay, hop count, originating router and route type for each path.
show ip eigrp topology active- Lists routes currently active and the neighbors that still owe a reply, marked r. The starting point for stuck in active.
show ip eigrp interfaces detail- Lists interfaces running EIGRP with peers, pacing, hello and hold settings and authentication. Passive interfaces are not listed.
show ip eigrp traffic- Counts hellos, updates, queries, replies, acks and SIA packets sent and received. Rising query counts point to something flapping.
show ip protocols- Shows each routing process with AS, K values, router ID, variance, maximum paths, network statements, passive interfaces and AD values.
Example
Output show ip protocols | include K1|Router-ID show ip route eigrp- Shows only EIGRP routes in the routing table, D for internal and D EX for external, with [AD/metric].
show eigrp address-family ipv4 neighbors- The named mode version of the neighbor table, labelled with the instance name and AS.
show eigrp address-family ipv4 topology- The named mode topology table, showing 64-bit wide metric values rather than the scaled routing table values.
debug eigrp packets- Prints EIGRP packets as they are sent and received, including ones ignored for authentication problems. Use briefly and on a quiet router.
clear ip eigrp neighbors 10.0.12.2- Resets one EIGRP adjacency. Without an address it resets all of them, which drops every EIGRP route on the router for a moment.
eigrp stub connected summary- Makes the router an EIGRP stub that advertises only connected and summary routes. Its neighbors stop sending it queries.
variance 2- Installs feasible successors whose metric is within twice the best metric, for unequal cost load sharing. In named mode it goes under topology base.
ip summary-address eigrp 100 10.20.0.0 255.255.252.0- Classic mode summary sent out this interface. Installs a Null0 discard route with AD 5 on the local router.
eigrp upgrade-cli CAMPUS- Converts a classic EIGRP configuration into named mode with the given name, without resetting neighbors.
show ip rip database- Shows every prefix RIP knows with hop count and source, including routes not installed because another protocol has lower AD.
debug ip rip- Prints RIP updates sent and received with each prefix and hop count. Handy for seeing split horizon and poisoned routes with metric 16.
timers basic 30 180 180 240- Sets the RIP update, invalid, holddown and flush timers. The values shown are the defaults. Must match on every RIP router.
show isis neighbors- Lists IS-IS adjacencies with system ID, level, interface, IP address, state and hold time.
show isis database detail- Shows every LSP per level with its prefixes, metrics and neighbors, plus the ATT, P and OL bits.
show clns interface GigabitEthernet0/0/0- Shows IS-IS settings on one interface, including circuit type, network type, metrics and hello timers.
set-overload-bit on-startup wait-for-bgp- Advertises the IS-IS overload bit after a reload until BGP has converged, so the router does not attract transit traffic too early.
NX-OS1
show ip eigrp topology- Shows the EIGRP topology table on NX-OS, with successors and feasible successors per prefix, like on IOS.
Arista EOS1
show isis neighbors- Lists IS-IS adjacencies on Arista EOS with system ID, interface, level and state.
Junos2
show isis adjacency- Lists IS-IS adjacencies with interface, system name, level and state on Junos.
show isis database- Shows the IS-IS link state database per level on Junos, with LSP IDs, sequence numbers and lifetimes.