Frame Relay Issue

* Check R2 routing table
R2#show ip route 10.1.4.4
Routing entry for 10.1.4.4/32
  Known via "ospf 1", distance 110, metric 65, type inter area
  Last update from 10.1.245.4 on Serial0/0, 00:01:17 ago
  Routing Descriptor Blocks:
  * 10.1.245.4, from 10.1.4.4, 00:01:17 ago, via Serial0/0
      Route metric is 65, traffic share count is 1
    
R2#ping 10.1.4.4 repeat 1
Sending 1, 100-byte ICMP Echos to 10.1.4.4, timeout is 2 seconds:
.
Success rate is 0 percent (0/1)

R2#ping 10.1.245.4 repeat 1
Sending 1, 100-byte ICMP Echos to 10.1.245.4, timeout is 2 seconds:
.
Success rate is 0 percent (0/1)

* Check R4 routing table
R4#show ip route 10.1.2.2
Routing entry for 10.1.2.2/32
  Known via "ospf 1", distance 110, metric 65, type inter area
  Last update from 10.1.245.2 on Serial0/0, 00:01:28 ago
  Routing Descriptor Blocks:
  * 10.1.245.2, from 10.1.2.2, 00:01:28 ago, via Serial0/0
      Route metric is 65, traffic share count is 1

R4#ping 10.1.2.2 repeat 1
Sending 1, 100-byte ICMP Echos to 10.1.2.2, timeout is 2 seconds:
.
Success rate is 0 percent (0/1)

R4#ping 10.1.245.2 repeat 1
Sending 1, 100-byte ICMP Echos to 10.1.245.2, timeout is 2 seconds:
.
Success rate is 0 percent (0/1)

* To Fix this problem we need too add new Frame Relay map on both Routers.

R2#show run in se0/0
!
interface Serial0/0
 ip address 10.1.245.2 255.255.255.0
 encapsulation frame-relay
 ip ospf hello-interval 4
 ip ospf priority 0
 clock rate 2000000
 frame-relay map ip 10.1.245.5 205 broadcast
end

R2#conf terminal 
R2(config)#in s0/0
R2(config-if)#frame-relay map ip 10.1.245.4 205 broadcast

R4#show run in ser 0/0 
!
interface Serial0/0
 ip address 10.1.245.4 255.255.255.0
 encapsulation frame-relay
 ip ospf hello-interval 4
 ip ospf priority 0
 clock rate 2000000
 frame-relay map ip 10.1.245.5 405 broadcast
end

R4#conf ter
R4(config)#in ser 0/0 
R4(config-if)#frame-relay map ip 10.1.245.2 405 broadcast


* Check again the connectivity. 
R4#ping 10.1.2.2 repeat 20
Sending 20, 100-byte ICMP Echos to 10.1.2.2, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (20/20), round-trip min/avg/max = 1/10/52 ms

R4#ping 10.1.245.2 repeat 20
Sending 20, 100-byte ICMP Echos to 10.1.245.2, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (20/20), round-trip min/avg/max = 1/8/44 ms

Split Horizon EIGRP

**Note The Serial Link between R3-R1 is down. R2 cannot reach Loopback 0 of R4 Network (10.1.4.0/24)

Split-horizon route advertisement is a method of preventing routing loops in distance-vector routing protocols by prohibiting a router from advertising a route back onto the interface from which it was learned.

# Issue Split Horizon 

R2#show ip route eigrp              
     10.0.0.0/24 is subnetted, 6 subnets
D       10.1.3.0 [90/409600] via 10.1.23.3, 00:03:26, FastEthernet0/0
D       10.1.5.0 [90/2297856] via 10.1.245.5, 00:07:56, Serial0/0
D       10.1.50.0 [90/2195456] via 10.1.245.5, 00:07:56, Serial0/0


# Desable The Split-Horizon
R5#conf terminal 
R5(config)#in serial 0/0
R5(config-if)#no ip split-horizon eigrp 1 

*Mar  1 07:03:57.838: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 10.1.245.2 (Serial0/0) is resync: split horizon changed
*Mar  1 07:03:57.842: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 10.1.245.4 (Serial0/0) is resync: split horizon changed

R2#
*Mar  1 07:03:53.442: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 10.1.245.5 (Serial0/0) is resync: peer graceful-restart

R2#show ip route eigrp 
     10.0.0.0/24 is subnetted, 11 subnets
D       10.1.3.0 [90/409600] via 10.1.23.3, 00:00:09, FastEthernet0/0
D       10.1.1.0 [90/2835456] via 10.1.245.5, 00:00:09, Serial0/0
D       10.1.6.0 [90/2835456] via 10.1.245.5, 00:00:09, Serial0/0
D       10.1.5.0 [90/2297856] via 10.1.245.5, 00:08:43, Serial0/0
D       10.1.4.0 [90/2809856] via 10.1.245.5, 00:00:09, Serial0/0
D       10.1.60.0 [90/2733056] via 10.1.245.5, 00:00:09, Serial0/0
D       10.1.50.0 [90/2195456] via 10.1.245.5, 00:08:43, Serial0/0
D       10.1.146.0 [90/2707456] via 10.1.245.5, 00:00:09, Serial0/0

Configuring a Point-to-Multipoint Frame Relay

R4#show run int se0/0
interface Serial0/0
 ip address 10.1.245.4 255.255.255.0
 encapsulation frame-relay
 clock rate 2000000
 frame-relay map ip 10.1.245.5 405 broadcast
end

R2#show run int se0/0
interface Serial0/0
 ip address 10.1.245.2 255.255.255.0
 encapsulation frame-relay
 clock rate 2000000
 frame-relay map ip 10.1.245.5 205 broadcast
end

R5#show run int se0/0
interface Serial0/0
 ip address 10.1.245.5 255.255.255.0
 encapsulation frame-relay
 clock rate 2000000
 frame-relay map ip 10.1.245.2 502 broadcast
 frame-relay map ip 10.1.245.4 504 broadcast
end