Hi ,
i have a task and i am required to configure two ip's from same
subnet , on two different frame relay interfaces.
on a physical interface this is not possible , but on a point to point
interface ..we can apply ip's from same subnet .
all i need is to configure OSPF network type " point to mutipoint "
and ping all interfaces
R2======== R1 ============R3
spoike------------hub----------------spoke
*on R1*
interface Serial0/0.12 point-to-point
ip address 172.16.124.1 255.255.255.0
frame-relay interface-dlci 102
R1#r s0/0.13
Building configuration...
Current configuration : 119 bytes
!
interface Serial0/0.13 point-to-point
ip address 172.16.124.4 255.255.255.0
frame-relay interface-dlci 103
*on R2*
!
interface Serial0/0
ip address 172.16.124.2 255.255.255.0
encapsulation frame-relay
ip ospf network point-to-point
serial restart-delay 0
frame-relay map ip 172.16.124.1 201 broadcast
frame-relay map ip 172.16.124.4 201
no frame-relay inverse-arp
*on R3*
interface Serial0/0
ip address 172.16.124.3 255.255.255.0
encapsulation frame-relay
i
frame-relay map ip 172.16.124.1 301 broadcast
frame-relay map ip 172.16.124.4 301 broadcast
no frame-relay inverse-arp
As you can see spokes have mappings for both ip's of hub.
now lets try to ping the spokes from hub
R1#ping 172.16.124.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.124.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R1#ping 172.16.124.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.124.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/21/76 ms
lets try once again
R1#ping 172.16.124.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.124.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R1#ping 172.16.124.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.124.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R1#ping 172.16.124.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.124.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/26/60 ms
*so it seems R2 is not rechable and R3 is always replying *
on R3 ...let turn debug
R3#show debug
Generic IP:
IP packet debugging is on
R3#
lets do " no service timestamps " so that actual message is more
apparent
R1#ping 172.16.124.2 repeat 1
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 172.16.124.2, timeout is 2 seconds:
.
IP: tableid=0, s=172.16.124.1 (Serial0/0), d=172.16.124.2 (Serial0/0),
routed via RIB
*IP: s=172.16.124.1 (Serial0/0), d=172.16.124.2 (Serial0/0), len 100,
redirected*
IP: tableid=0, s=172.16.124.3 (local), d=172.16.124.1 (Serial0/0), routed
via FIB
IP: s=172.16.124.3 (local), d=172.16.124.1 (Serial0/0), len 56, sending
IP: s=172.16.124.1 (Serial0/0), d=172.16.124.2 (Serial0/0), g=172.16.124.2,
len 100, forward
*IP: s=172.16.124.1 (Serial0/0), d=172.16.124.2 (Serial0/0), len 100,
encapsulation failed
*
adding ...spoke to spoke statements
R2(config)#int s0/0
R2(config-if)#fram
R2(config-if)#frame-relay map ip 172.16.124.3 201
R3(config)#int s0/0
R3(config-if)#fram
R3(config-if)#frame-relay map ip 172.16.124.2 301 b
*R1#debug frame-relay packet
Frame Relay packet debugging is on
*R1#ping 172.16.124.2 repeat 1
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 172.16.124.2, timeout is 2 seconds:
*Serial0/0.13(o): dlci 103(*0x1871), pkt type 0x800(IP), datagramsize 104
Serial0/0(i): dlci 103(0x1871), pkt type 0x800, datagramsize 104.
Success rate is 0 percent (0/1)
R1#
R1#
R1#ping 172.16.124.3 repeat 1
Type escape sequence to abort.
Sending 1, 100-byte ICMP Echos to 172.16.124.3, timeout is 2 seconds:
!
Success rate is 100 percent (1/1), round-trip min/avg/max = 40/40/40 ms
R1#
Serial0/0(i): dlci 102(0x1861), pkt type 0x800, datagramsize 80
Serial0/0(i): dlci 103(0x1871), pkt type 0x800, datagramsize 80
Serial0/0(i): dlci 103(0x1871), pkt type 0x800, datagramsize 80
Serial0/0(i): dlci 103(0x1871), pkt type 0x800, datagramsize 80
R1#*
Serial0/0.13(o): dlci 103(0x1871), pkt type 0x800(IP), datagramsize 104
Serial0/0(i): dlci 103(0x1871), pkt type 0x800, datagramsize 104*
it seems now R1 is only using one DLCI to reach both spokes ...ie 103
but strangely when i add ospf process on hub routers ...both spoke
become adjacent
R1(config-router)#network 172.16.124.1 0.0.0.0 a 0
R1(config-router)#ne
%OSPF-5-ADJCHG: Process 1, Nbr 172.16.124.2 on Serial0/0.12 from LOADING to
FULL, Loading Done
R1(config-router)#net
R1(config-router)#network 172.16.124.4 0.0.0.0 a 0
R1(config-router)#exit
R1(config)#exit
R1#
%OSPF-5-ADJCHG: Process 1, Nbr 172.16.124.3 on Serial0/0.13 from LOADING to
FULL, Loading Done
%SYS-5-CONFIG_I: Configured from console by console
R1#o
*Neighbor ID Pri State Dead Time Address Interface
172.16.124.3 0 FULL/ - 00:00:36 172.16.124.3
Serial0/0.13
172.16.124.2 0 FULL/ - 00:00:36 172.16.124.2
Serial0/0.12*
R1#
but even now i cant ping R2 ....
R1#ping 172.16.124.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.124.2, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R1#ping 172.16.124.2 so
R1#ping 172.16.124.2 source 172.16.124.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.124.2, timeout is 2 seconds:
Packet sent with a source address of 172.16.124.4
.....
Success rate is 0 percent (0/5)
R1#ping 172.16.124.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.124.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/36/88 ms
R1#ping 172.16.124.3 source 172.16.124.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.124.3, timeout is 2 seconds:
Packet sent with a source address of 172.16.124.4
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/16/44 ms
R1#se
Interface IP-Address OK? Method Status
Protocol
Serial0/0.12 172.16.124.1 YES manual up
up
Serial0/0.13 172.16.124.4 YES manual up
up
Can any body try out the same senario ... and post it
to summarize
*R2#o*
Neighbor ID Pri State Dead Time Address Interface
172.16.124.4 0 FULL/ - 00:00:31 172.16.124.1 Serial0/0
R2#ping 172.16.124.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.124.4, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R2#ping 172.16.124.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.124.1, timeout is 2 seconds:
clear ip ospf process..
*Mar 1 01:27:28.571: %OSPF-5-ADJCHG: Process 1, Nbr 172.16.124.4 on
Serial0/0 from FULL to DOWN, Neighbor Down: Interface down or detached
*Mar 1 01:27:29.099: %OSPF-5-ADJCHG: Process 1, Nbr 172.16.124.4 on
Serial0/0 from LOADING to FULL, Loading Done
R2#o
Neighbor ID Pri State Dead Time Address Interface
172.16.124.4 0 FULL/ - 00:00:38 172.16.124.1 Serial0/0
R2#ping 172.16.124.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.124.1, timeout is 2 seconds:
.....
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Received on Fri Sep 27 2013 - 17:02:53 ART
This archive was generated by hypermail 2.2.0 : Tue Oct 01 2013 - 06:36:35 ART