From Teknologisk videncenter
Comparing OSPF and EIGRP
| Parameter |
OSPF |
EIGRP
|
| Type |
Link State |
Distance vector
|
| Metric |
Bandwidth |
Bandwidth + delay
|
OSPF highlights
OSPF Highlights
| Term |
Explanation
|
| Router-ID |
Priority 1: Set with the router-id command
|
| Priority 2: Highest loopback IP address
|
| Priority 3: Highest active interface IP address
|
| DR Designated Router |
Priority 1: Highest priority. Set with the ip ospf priority command on the interface
|
| Priority 2: Higest Router-ID
|
| BDR Backup Designated Router |
Priority 1: Next highest priority. Set with the ip ospf priority command on the interface
|
| Priority 2: Next higest Router-ID
|
| Communication |
Uses multicast addresses 224.0.0.5 and 224.0.0.6
|
| 224.0.0.5 - Multicast to neighbours
|
| 224.0.0.6 - Multicast to DR and BDR. DR will relay the information to DROthers on 224.0.0.5
|
| Metric |
Uses bandwidth called cost - Default calculated as 108 / bandwidth
|
| Metric is the accumulated cost to the destination network
|
| default highest bandwidth is 108 = 100 Mbps. Change with the auto-cost reference-bandwidth command. Remember to change on all routers.
|
| Serial interfaces - Remember to set the bandwidth command on serial interfaces to reflect the actual clock rate. (1,544 Mbps or 128 Kbps default)
|
| Neighbour establisment |
Neighbours are established if hello- and dead-time interval are the same and network type are the same
|
| hello interval |
default 10 seconds on point-to-point and multi-access networks
|
| Default 30 seconds on non-broadcast multi-access (NBMA) segments (Frame Relay, X.25, ATM)
|
| Dead-time interval |
default 40 seconds on point-to-point and multi-access networks
|
| Default 120 seconds on non-broadcast multi-access (NBMA) segments (Frame Relay, X.25, ATM)
|