Dell POWEREDGE M1000E - Manual (Page 928)

38-36
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
OL-13270-03
Chapter 38 Configuring IP Unicast Routing
Configuring EIGRP
Configuring EIGRP
Note If the switch is running the IP base image, you can configure complete EIGRP routing. However, the
configuration is not implemented because the IP base image supports only EIGRP stub routing.
After you have entered the eigrp stub router configuration command, only the eigrp stub connected
summary command takes effect. Although the CLI help might show the receive-only and static
keywords, and you can enter these keywords, the switch running the IP base image always behaves as if
the connected and summary keywords were configured.
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. All
devices involved in a topology change can 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
network expansion 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 increments
as usual.
EIGRP offers these features:
• Fast convergence.
• Incremental updates when the state of a destination changes rather than sending the entire contents
of the routing table, minimizing the bandwidth required for EIGRP packets.
• Less CPU usage because full update packets need not be processed each time they are received.
• Protocol-independent neighbor discovery mechanism to learn about neighboring routers.
• Variable-length subnet masks (VLSMs).
• Arbitrary route summarization.
• Scalable for large networks.
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.
Table 38-6 Show IP OSPF Statistics Commands
Command Purpose