CHAPTER
29-1
Cisco ME 3800X and 3600X Switch Software Configuration Guide
OL-23400-01
29
Configuring IP Unicast Routing
This chapter describes how to configure IP Version 4 (IPv4) unicast routing on the Cisco ME 3800X and
ME 3600X switch. For more detailed IPv4 unicast configuration information, see the Cisco IOS IP
Configuration Guide, Release 12.2 For complete syntax and usage information for the commands used
in this chapter, see these command references:
• Cisco IOS IP Command Reference, Volume 1 of 3: Addressing and Services, Release 12.2
• Cisco IOS IP Command Reference, Volume 2 of 3: Routing Protocols, Release 12.2
• Cisco IOS IP Command Reference, Volume 3 of 3: Multicast, Release 12.2
This chapter has these sections:
• Understanding IP Routing, page 29-1
• Steps for Configuring Routing, page 29-2
• Configuring IP Addressing, page 29-3
• Enabling IPv4 Unicast Routing, page 29-16
• Configuring RIP, page 29-17
• Configuring OSPF, page 29-22
• Configuring EIGRP, page 29-33
• Configuring BGP, page 29-41
• Configuring ISO CLNS Routing, page 29-61
• Configuring BFD, page 29-71
• Configuring Multi-VRF CE, page 29-80
• Configuring Protocol-Independent Features, page 29-93
• Monitoring and Maintaining the IP Network, page 29-104
Understanding IP Routing
In an IP network, each subnetwork is mapped to an individual VLAN. However, network devices in
different VLANs cannot communicate with one another without a Layer 3 device (router) to route traffic
between the VLAN, referred to as inter-VLAN routing. You configure one or more routers to route traffic
to the appropriate destination VLAN.
Figure 29-1 shows a basic routing topology. Switch A is in VLAN 10, and Switch B is in VLAN 20. The
router has an interface in each VLAN.
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