Eigrp quesrie...

Unanswered Question
May 20th, 2009
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Hi Team,

Base on the network presented in the exhibit, Assuming that all routers have been configured to run eigrp in AS 100, and have also been configured to run eigrp on all connected links. if the link between R3 and R4 fails,

how many queries will R5 and R6 receive?


Topology are as follows:

10.10.1.0 /24--R1--R3--R4--R5--R6

|

|

10.10.2.0 /24--R2


R3 and R2 is also directly connected,


On R4 config are as follows:

Router eigrp 100

Netwok 0.0.0.0 0.0.0.0

Distribute-list 10 out

……..


Access-list 10 permit

10.10.1.0 0.0.0.255


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mukeshpal Wed, 05/20/2009 - 11:04
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Andrew,

thanks for replying, now my question is..for which netwrk 10.10.1.0 or 10.10.2.0 both (R5 and R6)RTR will recve one query each.

and as per my understanding as v r filtering out 10.10.1.0 n/w on R4, R5 shold recv one quesry for 10.10.2.0 frm R4 and R6 shd recv two qery for 10.10.1.0 and 10.10.2.0 .


correct me if I am wrong.


Regards...Mukesh

Giuseppe Larosa Wed, 05/20/2009 - 12:29
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Hello Mukesh,

R4 has an outbound distribute-list that allows only 10.10.1.0/24 to R5.

R5 and R6 are never aware of net 10.10.2.0/24.

So R4 should send a single query for 10.10.1.0/24 to R5, R5 sends a query to R6.


The key is what creates boundaries to queries?

- route summarizations

- route filters


only doubt is inbound or outbound filters ?

later a third tool has been added:




eigrp stub routers


Hope to help

Giuseppe



Hope to help

Giuseppe


Giuseppe Larosa Wed, 05/20/2009 - 13:06
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Hello Mukesh,

I've found the following link that explains interaction between distribute-lists, EIGRP queries and EIGRP replies.


see

http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094cb7.shtml#distlistsaffect


oubound route filters alter only replies and have no effects on Queries.


if so :

R4 sends two Queries to R5 and R5 sends two queries to R6.


Should R5 and R6 provide a path to 10.1.2.0/24 R4 would use it.


Hope to help

Giuseppe



Hope to help

Giuseppe




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