Cisco Systems 3750E manual Configuring Eigrp, Monitoring Ospf, 38-35

Chapter 38 Configuring IP Unicast Routing

Configuring EIGRP

Monitoring OSPF

You can display specific statistics such as the contents of IP routing tables, caches, and databases.

Table 38-6lists some of the privileged EXEC commands for displaying statistics. For more show ip ospf database privileged EXEC command options and for explanations of fields in the resulting display, see the Cisco IOS IP Command Reference, Volume 2 of 3: Routing Protocols, Release 12.2.

Table 38-6	Show IP OSPF Statistics Commands
Command		Purpose
show ip ospf [process-id]		Display general information about OSPF routing
		processes.
show ip ospf [process-id]database [router] [link-state-id]		Display lists of information related to the OSPF
show ip ospf [process-id]database [router] [self-originate]		database.
show ip ospf [process-id]database [router] [adv-router [ip-address]]
show ip ospf [process-id]database [network] [link-state-id]
show ip ospf [process-id]database [summary] [link-state-id]
show ip ospf [process-id]database [asbr-summary][link-state-id]
show ip ospf [process-id]database [external] [link-state-id]
show ip ospf [process-idarea-id]database [database-summary]
show ip ospf border-routes		Display the internal OSPF routing ABR and ASBR
		table entries.
show ip ospf interface [interface-name]		Display OSPF-related interface information.
show ip ospf neighbor [interface-name][neighbor-id]detail		Display OSPF interface neighbor information.
show ip ospf virtual-links		Display OSPF-related virtual links information.

Configuring EIGRP

Enhanced IGRP (EIGRP) is a Cisco proprietary enhanced version of the IGRP. EIGRP uses the same distance vector algorithm and distance information as IGRP; however, the convergence properties and the operating efficiency of EIGRP are significantly improved.

The convergence technology employs an algorithm referred to as the Diffusing Update Algorithm (DUAL), which guarantees loop-free operation at every instant throughout a route computation and allows all devices involved in a topology change to synchronize at the same time. Routers that are not affected by topology changes are not involved in recomputations.

IP EIGRP provides increased network width. With RIP, the largest possible width of your network is 15 hops. Because the EIGRP metric is large enough to support thousands of hops, the only barrier to expanding the network is the transport-layer hop counter. EIGRP increments the transport control field only when an IP packet has traversed 15 routers and the next hop to the destination was learned through EIGRP. When a RIP route is used as the next hop to the destination, the transport control field is incremented as usual.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02		38-35