From: vignesh sethuraman (sethuvignesh@yahoo.co.in)
Date: Sat Mar 21 2009 - 07:52:29 ART
Hello Experts,
When is-is adjacency is formed between routers which are connected via ATM or
Ethernet, they form by default L1/L2 adjacency, but when the routers are
connected via frame-relay, they form L2 adjacency by default.
I don't have any issues with the connectivity. If i ping from R1 loopback to
R5 loopback, its working fine, but when the routers are connected via
frame-relay, they form L2 adjacency by default instead of L1/L2 adjacency.
Here is my Scenario and Configs
R1 -- ATMSW--- R2---ethernet----R4 ----FRSW---R5
R1:
Rack1R1#sh run | b 4/0
interface ATM4/0
description Put ATM PVC Configs Here
ip address 150.1.12.1 255.255.255.0
ip router isis
no atm enable-ilmi-trap
pvc 0/102
protocol ip 150.1.12.2 broadcast
protocol clns 49.0024.0000.0000.0002.00 broadcast
!
interface Loopback0
ip address 150.1.1.1 255.255.255.0
ip router isis
end
!
router isis
net 49.0001.0000.0001.00
Rack1R1#sh clns is-neighbors
System Id Interface State Type Priority Circuit Id Format
Rack1R2 AT4/0 Up L2 64 Rack1R1.01 Phase V
R2:
Rack1R2#sh run | b 4/0
interface FastEthernet0/0
ip address 150.1.24.2 255.255.255.0
ip router isis
duplex half
isis circuit-type level-2-only
!
interface ATM4/0
ip address 150.1.12.2 255.255.255.0
ip router isis
no atm enable-ilmi-trap
pvc 0/201
protocol clns 49.0001.0000.0001.00 broadcast
protocol ip 150.1.12.1 broadcast
!
interface Loopback0
ip address 150.1.2.2 255.255.255.0
ip router isis
!
interface Loopback1
ip address 150.1.22.2 255.255.255.0
ip router isis
end
!
router isis
net 49.0024.0000.0000.0002.00
Rack1R2#sh clns is-neighbors
System Id Interface State Type Priority Circuit Id Format
Rack1R4 Fa0/0 Up L2 64 Rack1R4.01 Phase V
Rack1R1 AT4/0 Up L1L2 128/64 Rack1R1.01 Phase V
R4:
Rack1R4#sh run | b 0/0
interface Ethernet0/0
ip address 150.1.24.4 255.255.255.0
ip router isis
half-duplex
isis circuit-type level-2-only
!
interface Serial1/0
ip address 150.1.45.4 255.255.255.0
ip router isis
encapsulation frame-relay
serial restart-delay 0
frame-relay map ip 150.1.45.5 405 broadcast
frame-relay map clns 405 broadcast
no frame-relay inverse-arp
!
interface Loopback0
ip address 150.1.4.4 255.255.255.0
ip router isis
end
!
interface Loopback1
ip address 150.1.44.4 255.255.255.0
ip router isis
end
!
router isis
net 49.0024.0000.0000.0004.00
Rack1R4#sh clns is-neighbors
System Id Interface State Type Priority Circuit Id Format
Rack1R5 Se1/0 Up L2 64 Rack1R5.01 Phase V
Rack1R2 Et0/0 Up L2 64 Rack1R4.01 Phase V
R5:
!
interface Serial1/0
ip address 150.1.45.5 255.255.255.0
ip router isis
encapsulation frame-relay
serial restart-delay 0
frame-relay map ip 150.1.45.4 504 broadcast
frame-relay map clns 504 broadcast
no frame-relay inverse-arp
!
interface Loopback0
ip address 150.1.5.5 255.255.255.0
ip router isis
end
!
router isis
net 49.0005.0000.0000.0005.00
!
Rack1R5#sh clns is-neighbors
System Id Interface State Type Priority Circuit Id Format
Rack1R4 Se1/0 Up L2 64 Rack1R5.01 Phase V
To check connectivity, i used ping from R1 to R5, where 150.1.1.1 is R1's
loopback and 150.1.5.5 is R5's loopback.
Rack1R1#ping 150.1.5.5 source lo0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 150.1.5.5, timeout is 2 seconds:
Packet sent with a source address of 150.1.1.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 604/636/740 ms
Rack1R1#
Could you please someone tell me if I am missing anything in my config.
Thanks,
Vignesh
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