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| JayDot 2003-08-13, 2:15 pm |
| OK I Set up four 2509 router
I have OSPF config
I have the
R1 connected to Backbonerouter ethernet0
r1 connected to router2 serial0
r1 connected to router 3 serial1
r3 also connect to router 2 e0
The entie network is in area 0
backbonerouter is 10.0.0.0 network
interface connected to backbone 10.0.0.0 network is also 10. network
but the rest of the int are in 192.168.1.0 network
My question:
I have serial int's and Ethernet int's
How do u run OSPF in Broadcast network(ethernet) and in a NON Broadcast Network Point to point (serial Connection)
I thought serial point to point does not select dr or dbr in network -
I have two dr and 2 bdr in my current configs
Why and How is That | |
| ZacDogg 2003-08-13, 5:38 pm |
| A natural serial interface is seen by OSPF as a NBMA interface which does elect a DR and BDR. To make those interfaces point-to-point, thus stopping the election, you can use the interface command "ip ospf network point-to-point" or change the interface to a point-to-point subinterface. Which OSPF will see as a point-to-point network.
Zac | |
| SureshHomepage 2003-08-22, 9:33 pm |
| I am not referring your network anyway as I thought I would need some more info about the way Routers are connected.
In general,
1. On a ‘Broadcast’ permitted network like Ethernet, selection of DR & BDR is automatic as they are elected easily since they are well known broadcast multi access networks. Underline the word multiaccess network....any station can talk to any other station using a broadcast way meaning no manual intervention required to help them to communicate with each other. For this to happen, the requirement is that they have to be fully-meshed network.
2. On a ‘NBMA’ network like the Framrelay where 'broadcast' is not permitted. Someone has to do something to help the ospf routers to communicate with each other. So you manually insert the 'neighbour' statements to link the likely-minded routers together in order to run an election to select DR & BDR for them.
3. On a ‘point-to-multipoint’ network you do not have the DR & BDR concept but adjacency is formed automatically similar to the ‘point-to-point’. Remember the point-to-multipoint networks are nothing but a collection of point-to-point networks.
4. There is one slight variation on the point-to-multipoint network type. This new type is a 'non-broadcast' type in addition to the regular one in which case as I mentioned earlier the adjacency is formed automatically. But in the case of ‘non-broadcast’ type likely-minded routers needs to be a 'manually configured' to form adjacency for the very same reason that it does not support 'broadcast' and no DR & BDR here.
Hope this would help a bit. | |
| pra_143 2003-08-23, 6:32 am |
| Can any one tell me the good sites for Simulations & dumpquestion Software (website). | |
| SureshHomepage 2003-08-23, 7:18 am |
| pra_143!
You are on a wrong thread! |
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