EIGRP STUBS

EIGRP STUBS


Charter 14


To talk about stub router we need to understand first the query process..

When EIGRP removes a successor router and no FS exists, the router begins a process of router discovery  to reach that prefix.It's called "Going active"





  • So, it change the state , as you could see in "show ip eigrp" command  from passive to active
  • We will send EIGRP message to every neighbor  except the neighbor  in the failed route
  • When  a router receive a Reply message  from all neighbors to it sent any query message, that router can send  a reply message  to any  of it's neighbors  as necessary
When a Router has received a Reply  for all its query message , that router can use the best route  and confirm it's loop free 

Parameters for EIGRP Stub Command


Basically in this way we can minimize half of traffic.. 

What do we see here?

 R2 ( the second Router ) Got a serial and fa interface conection  to other routers and have several loop back address interfaces

10.12..0.0 /30 means it's a 255.255.255.252..the rest (24) it's a 255.255.255.0 connection

  • Please copy and paste
  •  int s0/0
    ip address 10.12.0.1 255.255.255.252
    no shut

    int fa0/0
    ip address 192.168.0.1 255.255.255.0
    no shut

    int s0/0
    ip address 10.12.0.1 255.255.255.0
    no shut
    int loopback2
    ip address 10.2.0.1 255.255.255.0
    no shut
    int loopback0
    ip address 10.1.0.1 255.255.255.0
    no shut
    int loopback3
    ip address 10.3.0.1 255.255.255.0
    no shut
    int loopback1
    ip address 10.1.0.1 255.255.255.0
    no shu
You will eventually have this:
we will do the same on R1

            We will do a small exercise:

In R2 we will do a #show ip int brief
In R1#debug ip eigrp
In R2 we will do a copy and paste:
conf t
int fa0/0
shut

and we will see the query process on R1 and after that the Reply on R2!

Now let's declare R1 as a stub router:
R1#router eigrp 100
R1#eigrp stub



To check if everything was done right..

R1#show run  | s router eigrp


Now let's  finally check on R2:
We see the default parameters that we mention at the beginning: connected and summary
EIGRP STUBS EIGRP STUBS Reviewed by victor melo on 1:15 PM Rating: 5

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