Need help reading Cisco 2650 running-config and understanding EIGRP

This is partial output of "Show running-config" on my Cisco 2650:

router eigrp 100
 redistribute static
 network 10.0.0.0
 network 192.168.12.0
 no auto-summary
 no eigrp log-neighbor-changes
!
ip classless
ip route 0.0.0.0 0.0.0.0 10.10.1.253
ip route 10.1.5.0 255.255.255.0 10.10.1.30
ip route 10.1.6.0 255.255.255.0 10.10.1.30

We used to have frame relay network, and 192.168.12.0 were the routes on this network.  It was replaced by a VPN/T1 WAN, where our Cisco concentrator's internal IP is 10.10.1.30.  As the migration was done, individual ip route entries were added to 10.10.1.30, and others (to 192.168.12.xx were removed.

Can someone please explain EIGRP?  Was its purpose only to redistribute IPs to the frame relay?  Can it be removed?

This Cisco 2650 router is the default gateway at my office, where the concentrator is located.  We are having fragmentation errors at my location (when packets are fragmented, only the first fragment is transmitted), and I am wondering if it is caused by the remains of the old frame relay.
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MashaCPAAsked:
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HodepineCommented:
It's hard to see what it was used from only from your description and a small output of the configuration, but let me ask you this:

Do you need to reach any other networks than the internet (through the default gateway) and your 10.1.5.0/24 and 10.1.6.0/24 networks? And is the 10.10.1.30 router also configured with static routes back to your local networks?

If those are the only networks you need to reach, and there's static routes configured on the other end as well, you should be ok to remove the EIGRP-config.

Just to be on the safe side, be ready to paste it back in, though. :)
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Otto_NCommented:
I agree with Hodepine, but would like to add:  Keep in mind that routing (and routing protocols) cannot be viewed only in context of one router.  The whole principle of routing is to forward packets VIA OTHER ROUTERS in order to reach it's destination.  So, to determine if you still require EIGRP, you will need to look at the complete network, and how routers in different segments know of other segments (and the default gateway).

An easy way to check, is to do a "show ip route" on the router (and it's EIGRP neighbors as well).  If the router's not learning any EIGRP routes, the EIGRP routes are not relevant, or the router has no EIGRP neighbors, you can safely remove EIGRP.

But routing should not cause fragmentation issues: My first suggestion would be to check MTU sizes on your various WAN links.
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MashaCPAAuthor Commented:
When I do show ip route eigrp, it shows nothing.  Show ip route static shows all my static routes.  Show ip route summary looks like this:
IP routing table name is Default-IP-Routing-Table(0)
Route Source    Networks    Subnets     Overhead    Memory (bytes)
connected       0           1           64          144
static          2           7           576         1296
eigrp 100       0           0           0           0
internal        2                                   2328
Total           4           8           640         3768

So, I am OK removing EIGRP, right?
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HodepineCommented:
Most likely you're good too remove it, but do "show ip eigrp neigh" just to be safe. If you don't have any neighbors, there's no one depending on learning routes from you either. THEN your 100% OK to remove it.
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MashaCPAAuthor Commented:
I have IOS 12.1 - this version does not have this command.  I tried all others though, and only static shows anything.
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HodepineCommented:
Hmm, you SHOULD have it.

Can you post output from "show ip protocol"?

And were you in enabled/privileged mode when you entered it?
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MashaCPAAuthor Commented:
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MashaCPAAuthor Commented:
show ip protocol
Routing Protocol is "eigrp 100"
  Outgoing update filter list for all interfaces is
  Incoming update filter list for all interfaces is
  Default networks flagged in outgoing updates
  Default networks accepted from incoming updates
  EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
  EIGRP maximum hopcount 100
  EIGRP maximum metric variance 1
  Redistributing: static, eigrp 100
  Automatic network summarization is not in effect
  Routing for Networks:
    10.0.0.0
    192.168.12.0
  Routing Information Sources:
    Gateway         Distance      Last Update
  Distance: internal 90 external 170
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MashaCPAAuthor Commented:
192.168.12.0 is the old frame relay that does not exist any more.
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HodepineCommented:
No sources. Go ahead and remove it.

Going to the cinema with the wife now, will look at the other later. :)
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MashaCPAAuthor Commented:
Thanks, have fun!
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MashaCPAAuthor Commented:
Thank you!
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