RE: eigrp SIA queries

Imran,

You don't have to do anything after the reconvergence process it comes
back up J

HTH

--------------------------

Kambiz Agahian

CCIE (R&S), CCSI, WAASSE, RSSSE

Technical Instructor

CCBOOTCAMP - Cisco Learning Solutions Partner (CLSP)

Email: kagahian_at_ccbootcamp.com

Toll Free: 877-654-2243

International: +1-702-968-5100

Skype: skype:ccbootcamp?call

FAX: +1-702-446-8012

YES! We take Cisco Learning Credits!

Training And Remote Racks: http://www.ccbootcamp.com

From: imran ali [mailto:immrccie_at_gmail.com]
Sent: Thursday, May 27, 2010 8:40 AM
To: Kambiz Agahian
Cc: ehtesham ali; Cisco certification
Subject: Re: eigrp SIA queries

Thanks for answer kambiz ,

I wanted to know if a neighbor is not responding to a query because of
any reason you mentioned above then that neighbor will not show up in "
sh ip eigrp neighbor " output.

how can i make the neighbor " up " again ?

now imagine the link for that network is up again for which queries ware
send but still one of my neighbor is not responding as he is waiting for
a response from his neighbor and so on..

as the network is up ... it does not make sense if the neighbor
relationship is down .

thanks

On Thu, May 27, 2010 at 8:54 PM, Kambiz Agahian
<kagahian_at_ccbootcamp.com> wrote:

Ehteshan,

The way that you're talking about the SIA issue is a bit "shaky".

First off, SIA is not a state of a "router". It is a condition that a
"route" may experience. It simply means this ROUTE is stuck in the
active mode (which basically is not a good thing in EIGRP - it means
struggling!).

Issue?
You send a query to another router asking for new information to take
one of your routes out of the active mode. You set a SIA timer for that
particular neighbor, however for some reasons (e.g. busy router or lossy
links), you never hear back from that neighbor and fail to converge.
Then you go ahead and clear all the routes beyond that neighbor from
your topology table.

Symptoms?
You have to start an EIGRP convergence process it takes some time
(depending on your table size - usually pretty quickly). This is not a
jail! It's just a re-convergence incident. You may experience
connectivity and packet loss issues during this short period.

Solution?
EIGRP is easy to configure, difficult to optimize. Ensure you don't have
to send a query to a router who might not be able to reply back in a
timely fashion. There are many ways to achieve this (e.g. filtering,
stub routing etc.)

The answer to the last question is pretty obvious but I'm going to leave
it to you to run a small lab with 3 routers and see what you can see :)
but generally speaking IGP's always work based on metrics they're hungry
to see links with lower metric...

HTH

--------------------------
Kambiz Agahian
CCIE (R&S), CCSI, WAASSE, RSSSE
Technical Instructor
CCBOOTCAMP - Cisco Learning Solutions Partner (CLSP)
Email: kagahian_at_ccbootcamp.com
Toll Free: 877-654-2243
International: +1-702-968-5100
Skype: skype:ccbootcamp?call
FAX: +1-702-446-8012
YES! We take Cisco Learning Credits!
Training And Remote Racks: http://www.ccbootcamp.com

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
ehtesham ali
Sent: Thursday, May 27, 2010 7:08 AM
To: Cisco certification
Subject: eigrp SIA queries

HI gurus,
i needed clarification on the following questions

1) router R1 running eigrp is struck in SIA . after three min R1 lost
neighbor relationship with R2 . how do i make R1 & R2 come out of SIA
..i
can think of rebooting the routers . but is there any command similar to
CLEAR IP OSPF PROCESS in Eigrp ?

whats the best way to make routers come out of SIA without rebooting
them ?
can i reset and restart the eigrp process again ?

or is it that the routers became neighbors automatically when SIA stops
say
after 5 min ?

2) if successor is down then traffic is routed via FS . After some time
successor comes online again .will the traffic now routed thorough
successor
? or it will continue to send through FS . (i mean is preemption is
available ? )

thanks

Blogs and organic groups at http://www.ccie.net
Received on Thu May 27 2010 - 08:46:48 ART