eigrp lab help

qplayed · March 2008

Hi guys,

I"m working on an eigrp lab and has left me scratching my head.
Here's the scenario: eigrp hub and spoke over frame relay

I have no problems with route being advertised etc...
my problem is even wth the route showing up n all the routers R1
is the only router that can ping r2 route and r3 routes
r2 cannot get to r3 and vice-versa....can someone shed some light
i know it has to be something i'm missing or not understanding correctly
TIA

172.16.124.0/29 ,r2
r1

(frame)---<
`r3

172.16.124.x (connected to frame)
R1:
loopbacks
10.1.x.x /19
...
...

s0/0
ip summ-add 10.1.0.0 255.255.0.0

net 10.0.0.0
net 172.16.0.0
no-auto
neigh r2
neigh r3

R2:
loopbacks
10.2.x.x /19
...
...

s0/3
ip summ-add 10.2.0.0 255.255.0.0

net 10.0.0.0
net 172.16.0.0
no-auto
neigh r1

R3:
loopbacks
10.3.x.x /19
...
...
s0/0
ip summ-add 10.3.0.0 255.255.0.0

net 10.0.0.0
net 172.16.0.0
no auto
neigh r1

networker050184 · March 2008

Check your next hop addresses.

mikej412 · March 2008

What's your frame relay configuration?
What are your frame relay mappings?

qplayed · March 2008

interface Serial0
 description Connected to R1
 no ip address
 no ip directed-broadcast
 encapsulation frame-relay
 no ip mroute-cache
 no fair-queue
 clockrate 64000
 frame-relay intf-type dce
 frame-relay route 102 interface Serial1 201
...
....
 frame-relay route 811 interface Serial8 800


interface Serial1
 description Connected to R3
 no ip address
 no ip directed-broadcast
 encapsulation frame-relay
 clockrate 64000
 frame-relay intf-type dce
 frame-relay route 201 interface Serial0 102
...
...


interface Serial8
 description Connected to R2(Serial0/3)
 no ip address
 no ip directed-broadcast
 encapsulation frame-relay
 clockrate 64000
 frame-relay intf-type dce
 frame-relay route 800 interface Serial0 811

     172.16.0.0/29 is subnetted, 1 subnets
C       172.16.124.0 is directly connected, Serial0/0
     10.0.0.0/8 is variably subnetted, 9 subnets, 2 masks
D       10.2.0.0/16 [90/20640000] via 172.16.124.2, 02:33:42, Serial0/0
D       10.3.0.0/16 [90/20640000] via 172.16.124.3, 03:03:16, Serial0/0
C       10.1.0.0/19 is directly connected, Loopback1
D       10.1.0.0/16 is a summary, 03:03:35, Null0
C       10.1.32.0/19 is directly connected, Loopback33
C       10.1.64.0/19 is directly connected, Loopback65
C       10.1.96.0/19 is directly connected, Loopback97
C       10.1.128.0/19 is directly connected, Loopback129
C       10.1.160.0/19 is directly connected, Loopback161
3640-R1_HQ#

     172.16.0.0/29 is subnetted, 1 subnets
C       172.16.124.0 is directly connected, Serial0/3
     10.0.0.0/8 is variably subnetted, 9 subnets, 2 masks
C       10.2.0.0/19 is directly connected, Loopback1
D       10.2.0.0/16 is a summary, 02:34:51, Null0
D       10.3.0.0/16 [90/41152000] via 172.16.124.1, 02:34:51, Serial0/3
D       10.1.0.0/16 [90/40640000] via 172.16.124.1, 02:34:51, Serial0/3
C       10.2.32.0/19 is directly connected, Loopback33
C       10.2.64.0/19 is directly connected, Loopback65
C       10.2.96.0/19 is directly connected, Loopback97
C       10.2.128.0/19 is directly connected, Loopback129
C       10.2.160.0/19 is directly connected, Loopback161
3640-R2_EAST#

     172.16.0.0/29 is subnetted, 1 subnets
C       172.16.124.0 is directly connected, Serial0/0
     10.0.0.0/8 is variably subnetted, 9 subnets, 2 masks
D       10.2.0.0/16 [90/41152000] via 172.16.124.1, 02:35:06, Serial0/0
C       10.3.0.0/19 is directly connected, Loopback1
D       10.3.0.0/16 is a summary, 03:04:40, Null0
D       10.1.0.0/16 [90/40640000] via 172.16.124.1, 03:04:40, Serial0/0
C       10.3.32.0/19 is directly connected, Loopback33
C       10.3.64.0/19 is directly connected, Loopback65
C       10.3.96.0/19 is directly connected, Loopback97
C       10.3.128.0/19 is directly connected, Loopback129
C       10.3.160.0/19 is directly connected, Loopback161
3640-R3_WEST#

dtlokee · March 2008

on R1's serial interface connected to the frame cloud disable split horizion for eigrp "no ip split-horizion eigrp <as#>"

qplayed · March 2008

split horizon is already disabled, it was part of the lab excercise

qplayed · March 2008

this will have to go to the back burner for now..i have a ton more labs t do...thanks guys for triyng....but if anyone does figure this one out....don't hesitate to chime in

mikej412 · March 2008

qplayed wrote:

but if anyone does figure this one out....don't hesitate to chime in

You never did post your frame relay configurations (that looked like your frame relay switch configuration

) of your routers or the output of show frame maps.

Physical interfaces? Sub Interfaces? Inverse Arp? Inverse Arp disabled? Looks like a single subnet from the routing table output. I guessed you may have disabled split horizon since you said you had the routes in the routing table.

But if you're on the same subnet and the next hop is on your "local network" -- it doesn't matter what the routing table says if you can't reach that next hop.

Do a debug IP Packet and ping from one hub to another and see if you see an encapsulation failed message in the debug output, then you have a layer 2 to layer 3 mapping issue.

qplayed · March 2008

R1
interface Serial0/0
 bandwidth 128
 ip address 172.16.124.1 255.255.255.248
 ip bandwidth-percent eigrp 1 40
 ip hello-interval eigrp 1 5
 ip hold-time eigrp 1 15
 encapsulation frame-relay
 no ip split-horizon eigrp 1
 ip summary-address eigrp 1 10.1.0.0 255.255.0.0 5


r2
interface Serial0/3
 bandwidth 64
 ip address 172.16.124.2 255.255.255.248
 encapsulation frame-relay
 ip summary-address eigrp 1 10.2.0.0 255.255.0.0 5

r3
interface Serial0/0
 bandwidth 64
 ip address 172.16.124.3 255.255.255.248
 encapsulation frame-relay
 ip summary-address eigrp 1 10.3.0.0 255.255.0.0 5

3640-R1_HQ#sh frame map
Serial0/0 (up): ip 172.16.124.2 dlci 811(0x32B,0xC8B0), dynamic,
              broadcast,, status defined, active
Serial0/0 (up): ip 172.16.124.3 dlci 102(0x66,0x1860), dynamic,
              broadcast,, status defined, active


3640-R2_EAST#sh fram map
Serial0/3 (up): ip 172.16.124.1 dlci 800(0x320,0xC800), dynamic,
              broadcast,, status defined, active


3640-R3_WEST#sh frame map
Serial0/0 (up): ip 172.16.124.1 dlci 201(0xC9,0x3090), dynamic,
              broadcast,, status defined, active

qplayed · March 2008

debug ip packet

does show an encapsulation failed message

Mar  3 00:49:59.455: IP: tableid=0, s=172.16.124.3 (local), d=172.16.124.2 (Serial0/0), routed via RIB
*Mar  3 00:49:59.459: IP: s=172.16.124.3 (local), d=172.16.124.2 (Serial0/0), len 100, sending
*Mar  3 00:49:59.459: IP: s=172.16.124.3 (local), d=172.16.124.2 (Serial0/0), len 100, encapsulation failed
*Mar  3 00:49:59.543: IP: s=10.3.1.1 (local), d=224.0.0.10 (Loopback1), len 60, sending broad/multicast
*Mar  3 00:49:59.543: IP: s=10.3.1.1 (Loopback1), d=224.0.0.10, len 60, rcvd 2.
*Mar  3 00:50:01.055: IP: s=10.3.33.1 (local), d=224.0.0.10 (Loopback33), len 60, sending broad/multicast
*Mar  3 00:50:01.055: IP: s=10.3.33.1 (Loopback33), d=224.0.0.10, len 60, rcvd 2
*Mar  3 00:50:01.455: IP: tableid=0, s=172.16.124.3 (local), d=172.16.124.2 (Serial0/0), routed via RIB
*Mar  3 00:50:01.455: IP: s=172.16.124.3 (local), d=172.16.124.2 (Serial0/0), len 100, sending
*Mar  3 00:50:01.455: IP: s=172.16.124.3 (local), d=172.16.124.2 (Serial0/0), len 100, encapsulation failed

dtlokee · March 2008

Since you are using a hub and spoke network you will need to add static frame relay maps on the spoke routers since inverse arp cannot create a mapping to the remote spoke.

qplayed · March 2008

dtlokee wrote:

Since you are using a hub and spoke network you will need to add static frame relay maps on the spoke routers since inverse arp cannot create a mapping to the remote spoke.

thank you soo much!

i love this board!
this board will have my first child!

qplayed · March 2008

ok...last question

was this something I should have known? if so, any suggested reading material?
or was this a simple oversight/mistake in my part?

thanks again

dtlokee · March 2008

It's covered in the CCNA to a degree, but it is not something most CCNA's would know to look at. When you were debugging and getting an "encapsulation failed" message that should lead you in the direction of a L2 framing issue possibly due to not having L2 information for the next hop. Also you should now realize that inverse arp only works when you have a fully meshed network. In other cases you will need to create static mappings on your multioint interfaces or create point to point interfaces as seperate subnets.

eigrp lab help

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