Okay so we are looking good and most of the lab is done, lets see if we can ping from R4 to R5 & R6's loopbacks
Checking the routing table, we know about the loopback interfaces from the two routers ...
R4#show ip route
1.0.0.0/24 is subnetted, 1 subnets
O IA 1.1.1.0 [110/129] via 10.24.0.2, 00:10:05, Serial0/0.1
2.0.0.0/24 is subnetted, 1 subnets
O IA 2.2.2.0 [110/65] via 10.24.0.2, 00:10:05, Serial0/0.1
3.0.0.0/24 is subnetted, 1 subnets
O IA 3.3.3.0 [110/129] via 10.24.0.2, 00:10:05, Serial0/0.1
4.0.0.0/24 is subnetted, 1 subnets
C 4.4.4.0 is directly connected, Loopback0
5.0.0.0/24 is subnetted, 1 subnets
O IA 5.5.5.0 [110/193] via 10.24.0.2, 00:03:49, Serial0/0.1
6.0.0.0/24 is subnetted, 1 subnets
O IA 6.6.6.0 [110/193] via 10.24.0.2, 00:01:40, Serial0/0.1
10.0.0.0/8 is variably subnetted, 4 subnets, 2 masksO IA 10.12.3.0/24 [110/128] via 10.24.0.2, 00:10:07, Serial0/0.1
C 10.24.0.0/24 is directly connected, Serial0/0.1
O IA 10.35.6.3/32 [110/128] via 10.24.0.2, 00:06:10, Serial0/0.1
O IA 10.35.6.0/24 [110/256] via 10.24.0.2, 00:03:52, Serial0/0.1
R4# ping 5.5.5.5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 5.5.5.5, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R4#ping 6.6.6.6
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 6.6.6.6, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
Okay, lets do a traceroute and see where this is going (lets turn off domain-lookup as i dont have DNS configured on these)
R4(config)#no ip domain lookup
R4(config)#do traceroute 5.5.5.5
Type escape sequence to abort.
Tracing the route to 5.5.5.5
1 10.24.0.2 68 msec 64 msec 28 msec
2 * * *
3 * * *
4 *
So it looks like are dying at Router2, lets jump over to Router2;
R2#show ip route
1.0.0.0/24 is subnetted, 1 subnets
O 1.1.1.0 [110/65] via 10.12.3.1, 00:13:48, Serial0/0.1
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback0
3.0.0.0/24 is subnetted, 1 subnets
O 3.3.3.0 [110/65] via 10.12.3.3, 00:13:48, Serial0/0.1
4.0.0.0/24 is subnetted, 1 subnets
O 4.4.4.0 [110/65] via 10.24.0.4, 00:17:45, Serial0/1.1
5.0.0.0/24 is subnetted, 1 subnets
O IA 5.5.5.0 [110/129] via 10.12.3.3, 00:11:30, Serial0/0.1
6.0.0.0/24 is subnetted, 1 subnets
O IA 6.6.6.0 [110/129] via 10.12.3.3, 00:09:22, Serial0/0.1
10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C 10.12.3.0/24 is directly connected, Serial0/0.1
C 10.24.0.0/24 is directly connected, Serial0/1.1
O IA 10.35.6.3/32 [110/64] via 10.12.3.3, 00:13:51, Serial0/0.1
O IA 10.35.6.0/24 [110/192] via 10.12.3.3, 00:11:34, Serial0/0.1
R2# ping 5.5.5.5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 5.5.5.5, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
Nope, as thought going no where, trace route confirms;
R2(config)#no ip domain loo
R2(config)#do traceroute 5.5.5.5
Type escape sequence to abort.
Tracing the route to 5.5.5.5
1 * *
If we look at the routing table again, notice the routes are learnt via 10.12.3.3 ... here lies the problem, as R2 is NOT directly connected to R3, although it believes it is (as being on the same subnet, it would believe it is) but it has to go to R1 first!
As objective 4 says, we cannot add PVCs by modifying the FRS configs, SO .... lets check our map status on the interface
R2#show run int ser0/0.1
interface Serial0/0.1 multipoint
ip address 10.12.3.2 255.255.255.0
ip ospf priority 0
frame-relay map ip 10.12.3.1 201 broadcast
end
We are going to need another frame-relay map statement so that R2 knows what dlci to go to in order to reach R3:
R2(config)#inter seri0/0.1
R2(config-subif)#frame-relay map ip 10.12.3.3 201 broadcast
Now, we need R3 to have a mapping back to R2, same principle:
R3(config)#inter seri0/0.1
R3(config-subif)#frame-relay map ip 10.12.3.2 301 broadcast
thats better:
R3#show frame-relay map
Serial0/0.1 (up): ip 10.12.3.1 dlci 301(0x12D,0x48D0), static,
broadcast,
CISCO, status defined, active
Serial0/0.1 (up): ip 10.12.3.2 dlci 301(0x12D,0x48D0), static,
broadcast,
CISCO, status defined, active
Serial0/1.1 (up): ip 10.35.6.5 dlci 305(0x131,0x4C10), static,
broadcast,
CISCO, status defined, active
Serial0/1.1 (up): ip 10.35.6.6 dlci 306(0x132,0x4C20), static,
broadcast,
CISCO, status defined, active
So, lets try that ping again from R4 to R5 & R6
R4# ping 5.5.5.5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 5.5.5.5, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 96/143/252 ms
R4#ping 6.6.6.6
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 6.6.6.6, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 28/129/320 ms
This goes to show and demostrate the network types and the problems/issues that can arise with NBMA
Next Lab ...
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