Datasheet

Lab – Configuring Frame Relay and Subinterfaces

R1# undebug all

All possible debugging has been turned off

Step 2: Remove the IPv4 frame map from R1.

a. Issue the no frame-relay map command to remove the IPv4 frame map on R1.

R1(config)# interface s0/0/0

R1(config-if)# no frame-relay map ip 10.1.1.2 103 broadcast

b. Issue the debug ip icmp command on R1.

R1# debug ip icmp

ICMP packet debugging is on

c. Ping R1 from R3. Pings should not be successful. However, debug messages on R1 show that the ICMP

packets from R3 are reaching R1.

Note: You should see console messages reporting the EIGRP adjacency going up and down. This is

sometimes called flapping.

R3# ping 10.1.1.1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

R1#

*Jun 26 20:12:35.693: ICMP: echo reply sent, src 10.1.1.1, dst 10.1.1.2, topology

BASE, dscp 0 topoid 0

R1#

*Jun 26 20:12:37.689: ICMP: echo reply sent, src 10.1.1.1, dst 10.1.1.2, topology

BASE, dscp 0 topoid 0

R1#

*Jun 26 20:12:39.689: ICMP: echo reply sent, src 10.1.1.1, dst 10.1.1.2, topology

BASE, dscp 0 topoid 0

R1#

*Jun 26 20:12:41.689: ICMP: echo reply sent, src 10.1.1.1, dst 10.1.1.2, topology

BASE, dscp 0 topoid 0

R1#

*Jun 26 20:12:43.689: ICMP: echo reply sent, src 10.1.1.1, dst 10.1.1.2, topology

BASE, dscp 0 topoid 0

Why does the ping fail?

____________________________________________________________________________________

The ping fails because R1 has no way to reply. With no way to map the IP address of R3 to a Layer 2

DLCI, it cannot route the response and drops the packet.

d. Issue the show frame-relay map command on R1. The IPv4 map for R3 is missing from the list.

R1# show frame-relay map

Serial0/0/0 (up): ipv6 FE80::3 dlci 103(0x67,0x1870), static,

broadcast,

CISCO, status defined, active

Serial0/0/0 (up): ipv6 2001:DB8:ACAD:B::1 dlci 103(0x67,0x1870), static,