First is that suppose in an internetwork we are running EIGRP as our routing protocol and some of the routers are running with AS 10 and some are running with AS 15. Now how will the routers from these 2 ASs will be able to communicate with each other?
Secondly, in the same network we have some routers running on Rip, some on EIGRP and some on OSPF. now is there a way for routers running on different protocols to communicate with each other?
all routing protocols use a different way of calculating the metric( the cost of the path to the prefix) and when multiple longest matches are coming from same protocol then the lowest metric wins and is inserted in the routing table.
As each protocol speaks a different language( hop count of RIP, composite metric of EIGRP, cost of OSPF) then you must translate from one to the other and to do this on the redistribution point you must set the seed metric.
You can do it in 2 ways:
- default-metric command under routing process where you are redistributing others
- the metric keyword in the redistribute command in the same place
The second way will always override the first one.
Now there are default seed metrics but EIGRP and RIP have a default of infinite so if you don't specify one the prefixes won't get redistributed into EIGRP or RIP.
how will i use default metric command? and can i use any value for the metric cos it wants me to specify a value. secondly how do we determine a redistribution router or it can be anyone according to the topology design?
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