Cisco Systems 78-11741-02 Configuring Simplex Ethernet Interfaces, Configuring a DRP Server Agent

Configuring IP Services

Managing IP Connections

IP provides a provision known as source routing that allows the source IP host to specify a route through the IP network. Source routing is specified as an option in the IP header. If source routing is specified, the software forwards the packet according to the specified source route. This feature is employed when you want to force a packet to take a certain route through the network. The default is to perform source routing.

To enable IP source-route header options if they have been disabled, use the following command in global configuration mode:

Command	Purpose
Router(config)# ip source-route	Enables IP source routing.

Configuring Simplex Ethernet Interfaces

You can configure simplex Ethernet interfaces. This feature is useful for setting up dynamic IP routing over a simplex circuit (a circuit that receives only or sends only). When a route is learned on a receive-only interface, the interface designated as the source of the route is converted to the interface you specify. When packets are routed out this specified interface, they are sent to the IP address of the source of the routing update. To reach this IP address on a transmit-only Ethernet link, a static Address Resolution Protocol (ARP) entry mapping this IP address to the hardware address of the other end of the link is required.

To assign a transmit interface to a receive-only interface, use the following command in interface configuration mode:

Command	Purpose
Router(config-if)# transmit-interfacetype number	Assigns a transmit interface to a receive-only interface.

See the “Simplex Ethernet Interfaces Example” section at the end of this chapter for an example of configuring a simplex Ethernet interface.

Configuring a DRP Server Agent

The Director Response Protocol (DRP) is a simple User Datagram Protocol (UDP)-based application developed by Cisco Systems. It enables the Cisco DistributedDirector product to query routers (DRP Server Agents) in the field for Border Gateway Protocol (BGP) and Interior Gateway Protocol (IGP) routing table metrics between distributed servers and clients. DistributedDirector, a separate standalone product, uses DRP to transparently redirect end-user service requests to the topologically closest responsive server. DRP enables DistributedDirector to provide dynamic, scalable, and “network intelligent” Internet traffic load distribution between multiple geographically dispersed servers.

DRP Server Agents are border routers (or peers to border routers) that support the geographically distributed servers for which DistributedDirector service distribution is desired. Note that, because DistributedDirector makes decisions based on BGP and IGP information, all DRP Server Agents must have access to full BGP and IGP routing tables.

Refer to the Cisco DistributedDirector 2501 Installation and Configuration Guide or the Cisco DistributedDirector 4700-M Installation and Configuration Guide for information on how to configure DistributedDirector.

Cisco IOS IP Configuration Guide

IPC-85