Re: Maximum Metric for OSPF E1 Routes

Thanks Marko,
 
I was thinking the same thing and decided to just test it.
When I did, the router is actually accepting a metric that is even larger then
24 bits. Redistributed a connected route with the max value and then put an
ospf cost of 5000 on the receiving interface of the neighbor router. The
neighbor router still has the route in the table. Not sure if this is just a
Cisco thing or maybe the RFC doesn't specify an actual maximum. Its very
interesting.
 
 
R1(config-router)#$e connected metric-type 1 metric ?
 
<0-16777214> OSPF default metric
R1(config-router)#redistribute connected
metric-type 1 metric 16677214 subnets
 
---------------------
 
R2(config-if)#do show ip route
Codes: C - connected, S - static, R - RIP, M -
mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF
inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type
2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i -
IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia -
IS-IS inter area, * - candidate default, U - per-user static route
       o -
ODR, P - periodic downloaded static route
Gateway of last resort is not set
     1.0.0.0/24 is subnetted, 1 subnets
O E1 1.1.1.0 [110/16782214] via
10.1.1.1, 00:00:03, FastEthernet0/0
     10.0.0.0/24 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, FastEthernet0/0

Make a small loan,
Make a big difference - Kiva.org
 

________________________________
 From:
Marko Milivojevic <markom_at_ipexpert.com>
To: Dave Serra <maybeedave_at_yahoo.com>
Cc: Cisco certification <ccielab_at_groupstudy.com>
Sent: Monday, April 30, 2012
12:20 PM
Subject: Re: Maximum Metric for OSPF E1 Routes
  
Dave,

Router LSAs
can have a much larger *calculated* metric than that.
That's the maximum
interface cost that can be carried in the LSA. I'd
have to check the format,
but on top of my head, I think the external
metric is a 24bit value.

--
Marko
Milivojevic - CCIE #18427 (SP R&S)
Senior CCIE Instructor - IPexpert
On Mon,
Apr 30, 2012 at 05:05, Dave Serra <maybeedave_at_yahoo.com> wrote:
> Hi Guys,
>
>
I know the maximum metric a router LSA can have is 65534 but is
> that the
same for E1 routes? B We are using some pretty large metrics in our
> network
and I don't want routes to go dead on me.
>
> Thanks!
>
> Make a small
> loan,
Make a big difference - Kiva.org
>
>
> Blogs and organic groups at
http://www.ccie.net
>
>