IBM 9077 manual Overview of Supported Routing Protocols, Switched Routers

	Unswitched Data
	Switched Data
2	5

			Router	Examples:
	1		4	Ascend GRF, SP Switch Router
			Router	Cisco 12000
		3
			Router
				Disadvantages:
				Hardware can be hard to upgrade *
				Reduced routing functions *
	Switch		Switch
Layer 3	Process Route		Process Route	Advantages:
				Behave like traditional router
Layer 2				Not dependent on a network architecture
				Interoperability

Figure 9. Switched Routers

Other advantages of using GRF are as follows:

•Availability of a redundant power supply

•Availability of a redundant fan

•Availability of a hot-swappable power supply

•Availability of a hot-swappable fan (model 16S only)

•Availability of hot-swappable media adapters (to connect to networks)

•Scalability of up to 4 or 16 media adapters, depending on the GRF model

Perhaps the greatest advantage of using the GRF is improved price/performance. As previously mentioned, the GRF is a dedicated router, and as such it is much more cost effective for routing IP traffic than using dedicated RS/6000 SP node.

2.1.6 Overview of Supported Routing Protocols

In addition to static routes, various routing protocols are available on the GRF, as follows:

RIPRouting Information Protocol Version 1 or 2 (RIP 1 or 2)

OSPFOpen Shortest Path First

IS-ISIntermediate System to Intermediate System (an OSI gateway protocol)

Router Node 15