From: Chris Lewis (chrlewiscsco@gmail.com)
Date: Sun Jan 08 2006 - 13:40:27 GMT-3
What does the output of the show ip eigrp nei on R2 and R5 show you?
On 1/8/06, siegfried.droogmans@skynet.be <siegfried.droogmans@skynet.be>
wrote:
>
> Long mail for a basic issue with EIGRP:
>
> I want to test EIGRP split-horizon in a Hub-and-Spoke setup. Hub is R6,
> Spokes are R2 and R5:
>
> 206
> -------- R2
> 602 /
> R6 ------- FR-switch
> 605 \
> -------- R5
> 506
>
> There is a network on R5 that I do NOT want to receive on R2 because of
> split-horizon in R6. Sadly enough that is not what is happening:
>
> r2#show ip route
> ...
> 150.50.0.0/16 is variably subnetted, 2 subnets, 2 masks
> D 150.50.7.0/25 [90/2172416] via 150.50.100.5, 00:10:24, Serial0/1/0
> ----> ???
> C 150.50.100.0/24 is directly connected, Serial0/1/0
> r2
>
> R6:
> interface Serial4/0
> no ip address
> encapsulation frame-relay
> !
> interface Serial4/0.256 multipoint
> ip address 150.50.100.6 255.255.255.0
> no arp frame-relay
> frame-relay map ip 150.50.100.2 602 broadcast
> frame-relay map ip 150.50.100.5 605 broadcast
> no frame-relay inverse-arp
> !
> router eigrp 1
> network 150.50.0.0
> no auto-summary
>
> R2:
> interface Serial0/1/0
> ip address 150.50.100.2 255.255.255.0
> encapsulation frame-relay
> no arp frame-relay
> frame-relay map ip 150.50.100.5 206 broadcast
> frame-relay map ip 150.50.100.6 206 broadcast
> no frame-relay inverse-arp
> !
> router eigrp 1
> network 150.50.0.0
> no auto-summary
>
> R5:
> interface FastEthernet0/0
> ip address 150.50.7.5 255.255.255.128
> duplex auto
> speed auto
> !
> interface Serial0/1/0
> ip address 150.50.100.5 255.255.255.0
> encapsulation frame-relay
> no arp frame-relay
> frame-relay map ip 150.50.100.2 506 broadcast
> frame-relay map ip 150.50.100.6 506 broadcast
> no frame-relay inverse-arp
>
> The problem is that R5 DOES receive the route. The traces are a bit
> confusing. Here's the trace when I 'no shut' F0/0 on R5:
> R6:
> r6#
> *Jan 8 09:25:28.223: IP-EIGRP(Default-IP-Routing-Table:1): Processing
> incoming UPDATE packet
> *Jan 8 09:25:28.223: IP-EIGRP(Default-IP-Routing-Table:1): Int
> 150.50.7.0/25 M 2172416 - 1657856 514560 SM 28160 - 25600 2560
> *Jan 8 09:25:28.239: IP-EIGRP(Default-IP-Routing-Table:1): Int
> 150.50.7.0/25 metric 2172416 - 1657856 514560
> *Jan 8 09:25:28.255: IP-EIGRP(Default-IP-Routing-Table:1): Int
> 150.50.7.0/25 metric 2172416 - 1657856 514560
> *Jan 8 09:25:28.259: IP-EIGRP(Default-IP-Routing-Table:1): Processing
> incoming UPDATE packet
> *Jan 8 09:25:28.259: IP-EIGRP(Default-IP-Routing-Table:1): Int
> 150.50.7.0/25 M 4294967295 - 1657856 4294967295 SM 4294967295 - 1657856
> 4294967295
> r6#
>
> R2:
> r2#
> *Jan 8 09:31:07.315: IP-EIGRP(Default-IP-Routing-Table:1): Processing
> incoming UPDATE packet
> *Jan 8 09:31:07.315: IP-EIGRP(Default-IP-Routing-Table:1): Int
> 150.50.7.0/25 M 2172416 - 1657856 514560 SM 28160 - 25600 2560
> *Jan 8 09:31:07.315: IP-EIGRP(Default-IP-Routing-Table:1): route
> installed for 150.50.7.0 ()
> *Jan 8 09:31:07.331: IP-EIGRP(Default-IP-Routing-Table:1): Int
> 150.50.7.0/25 metric 2172416 - 1657856 514560
> *Jan 8 09:31:07.343: IP-EIGRP(Default-IP-Routing-Table:1): Processing
> incoming UPDATE packet
> *Jan 8 09:31:07.343: IP-EIGRP(Default-IP-Routing-Table:1): Int
> 150.50.7.0/25 M 4294967295 - 1657856 4294967295 SM 4294967295 - 1657856
> 4294967295
> r2#
> *Jan 8 09:31:07.347: IP-EIGRP(Default-IP-Routing-Table:1): Int
> 150.50.7.0/25 metric 2172416 - 1657856 514560
> r2#
>
> I'm working on ProctorLabs gear. FR-Switch config is below.
> R2: 3800 12.4(3a)
> R5: 2800 12.4(3a)
> R6: 7200 12.1
>
>
> FYI: split-horizon on R6 works fine: it does not advertise the route out
> Serial4/0.256 (when I configure "no ip split-horizon eigrp 1 I CAN see "do
> advertise out Serial4/0.256")
>
> I just don't understand why/how R2 is receiving the route.
>
>
> Any help would be most welcome!
>
> Ziggy
>
> FR-switch:
>
> interface Serial0
> description Connection to R2 INT S0/1/0
> no ip address
> encapsulation frame-relay
> no ip mroute-cache
> no fair-queue
> clockrate 4000000
> frame-relay intf-type dce
> frame-relay route 104 interface Serial1 401
> frame-relay route 105 interface Serial2 501
> frame-relay route 106 interface Serial3 601
> frame-relay route 204 interface Serial1 402
> frame-relay route 205 interface Serial2 502
> frame-relay route 206 interface Serial3 602
> no shut
> !
> interface Serial1
> description Connection to R4 INT s0/0/0
> no ip address
> encapsulation frame-relay
> clockrate 4000000
> frame-relay intf-type dce
> frame-relay route 401 interface Serial0 104
> frame-relay route 402 interface Serial0 204
> frame-relay route 405 interface Serial2 504
> frame-relay route 406 interface Serial3 604
> no shut
> !
> interface Serial2
> description Connection to R5 int S0/1/0
> no ip address
> encapsulation frame-relay
> clockrate 4000000
> clockrate 115200
> frame-relay intf-type dce
> frame-relay route 501 interface Serial0 105
> frame-relay route 502 interface Serial0 205
> frame-relay route 504 interface Serial1 405
> frame-relay route 506 interface Serial3 605
> no shut
> !
> interface Serial3
> description Connection to R6 Int S4/0
> no ip address
> encapsulation frame-relay
> clockrate 4000000
> clockrate 115200
> frame-relay intf-type dce
> frame-relay route 601 interface Serial0 106
> frame-relay route 602 interface Serial0 206
> frame-relay route 604 interface Serial1 406
> frame-relay route 605 interface Serial2 506
> no shut
> !
>
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