Summaraisation and Advanced Summaraisation - lab 3  

Monday, January 5, 2009

done with lab 3 summaraisation and advanced summaraisation

as always everything is cool and new point / concept "leak map"

Configuring leak-map option allows us to advertise a component route (one or more specific networks of a summary route) that would otherwise be
suppressed by the manual summaraisation .

Three rules :

If the leak-map is configured to reference a route-map that does not exist, only the summary route is advertised and the more specific routes are
suppressed

If the leak-map is configured to reference a route-map and the route-map is referencing an access-list that does not exist , then the summary routes and all
the specific routes are advertised

If the leakmap is configured to reference a route-map and the route-map matches and acl , all the permitted networks b the acl will be advertised along with
the summary route




for example we have

CODE
working

2.2.4.2
2.2.5.2
2.2.6.2
2.2.7.2


number 128 64 32 16 8 4 2 1

4 0 0 0 0 0 1 0 0
5 0 0 0 0 0 1 0 1
6 0 0 0 0 0 1 1 0
7 0 0 0 0 0 1 1 1

2.2.4.0/(8+8+6)

2.2.4.0/22

2.2.4.0 255.255.252.0


we have a summary address 2.2.4.0/22

1. int fa0/0
ip summa eigrp 100 2.2.4.0 255.255.252.0 leak-map rakesh---------------------> (rakesh is the name of the route-map which is not configured)

in this case only summary route is advertised which will be equal to the commands output "ip summa eigrp 100 2.2.4.0 255.255.252.0"

2.

route-map rakesh permit 10
match ip address 77(----------------> acl is not configured)
int fa0/0
ip summa eigrp 100 2.2.4.0 255.255.252.0 leak-map rakesh---------------------> (rakesh is the name of the route-map which has no access-list)

in this case all of the specific and summary routes are advertised i,e

2.2.4.0
2.2.4.0
2.2.5.0
2.2.6.0
2.2.7.0

3.

both acl and route-map are configured

access 66 permit 2.2.6.0 0.0.0.255
route-map rakesh permit 10
match ip address 66

int fa0/0
ip summ eigrp 100 2.2.4.0 255.255.252.0 leak rakesh

this would advertise summary address and address we wanted to permit/ deny in the acl .. look there is an implicit deny which is followed

this is what that i found interesting ...

i need more clear understanding !!! in what sense ? well iam not happy with the output .. first of all what is the use of leak-map .. next ok that is general sense of the question ... but it is behaving differently for different set of rules .. how does it allow / deny packets or how does it work ... so on ...? iam gonna post this question and will let you know




guday

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