by Matthew G. Naugle
Wiley Computer Publishing, John Wiley & Sons, Inc.
ISBN: 0471196568 Pub Date: 11/01/98
|
|
Illustrated TCP/IP
by Matthew G. Naugle Wiley Computer Publishing, John Wiley & Sons, Inc. ISBN: 0471196568 Pub Date: 11/01/98 |
| Previous | Table of Contents | Next |
When reading through the following sections on the OSPF protocol, keep one main goal in mind: network design. OSPF allows us to build very efficient networks through segmenting of an autonomous system into small groups called areas, variable-length subnet masks, Type of Service routing, and a host of other betterments compared to the RIP protocol. It was mentioned at the beginning of this section that there are two types of routing methods: IGP and EGP. The table compares RIP with OSPF.
| Function/Feature | RIPv1 | RIPv2 | OSPF |
|---|---|---|---|
| Standard number | RFC 1058 | RFC 1723 | RFC 2178 |
| Link-state protocol | No | No | Yes |
| Large range of metrics | Hop count (16=Infinity) | Hop count (16=Infinity) | Yes, based on 1–65535 |
| Update policy | Route table every 30 seconds | Route table every 30 seconds | Link-state changes, or every 30 seconds |
| Update address | Broadcast | Broadcast, multicast | Multicast |
| Dead interval | 300 seconds total | 300 seconds total | 300 seconds total, but usually much less |
| Supports authentication | No | Yes | Yes |
| Convergence time | Variable (based on number of routers × dead interval) | Variable (based on number of routers × dead interval) | Media delay + dead interval |
| Variable-length subnets | No | Yes | Yes |
| Supports supernetting | No | Yes | Yes |
| Type of Service (TOS) | No | No | Yes |
| Multipath routing | No | No | Yes |
| Network diameter | 15 hops | 15 hops | 65535 possible |
| Easy to use | Yes | Yes | No |
|
A Routing Protocol Comparison
|
| Previous | Table of Contents | Next |