From: Kumar, Manoj (manoj.kumar@citigroup.com)
Date: Wed Aug 03 2005 - 11:55:30 GMT-3
Did you try shutting down the other links between R3 and R1 (if I remember correctly, this setup has multiple connections between R1 and R3, ethernet, FR and p2p) you will find that R1 isis database will stop synchronizing with that R5 and R5 will not see any routes from R1.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
kumara.shunmugam@wipro.com
Sent: Wednesday, August 03, 2005 5:43 PM
To: ccielab@groupstudy.com
Subject: IWEB Lab 14 Task 5.11 IS-IS in HUB-n-SPOKE
Hi all
There was a requirement in the lab to establish L2 neighbor-ship between
R1,R3,R5 , where R3 is HUB for both other routers. As per the Solution ISIS
will not work properly on hub-spoke technology due to its lack of network type
availability (isis network command) .The solution was to create GRE tunnel
between these thee (R3 to R1 & R3 to R5). But I am wondering , without doing
this , the neighbor-ship got estabilished for me and routes are also properly
advertising with proper next-hop IP. DIS selection was also very smooth .. I
think there should be some hidden issue which might popup later if I continue
to use this setup.. Can anyone tell me what could be the reason..
R3 -Config
interface Serial1/0
ip address 167.1.135.3 255.255.255.0
ip router isis
encapsulation frame-relay
serial restart_delay 0
frame-relay map clns 301 broadcast
frame-relay map clns 305 broadcast
frame-relay map ip 167.1.135.1 301 broadcast
frame-relay map ip 167.1.135.5 305 broadcast
router isis
net 00.3490.0001.0001.0003.00
is-type level-2-only
R3#show clns is-neighbors
System Id Interface State Type Priority Circuit Id Format
R1 Se1/0 Up L2 64 R5.02 Phase V
R5 Se1/0 Up L2 64 R5.02 Phase V
R3#show clns neighbors
System Id Interface SNPA State Holdtime Type Protocol
R1 Se1/0 DLCI 301 Up 26 L2 IS-IS
R5 Se1/0 DLCI 305 Up 8 L2 IS-IS
Gateway of last resort is not set
C 204.12.1.0/24 is directly connected, FastEthernet0/0
167.1.0.0/16 is variably subnetted, 4 subnets, 2 masks
C 167.1.135.0/24 is directly connected, Serial1/0
C 167.1.34.0/24 is directly connected, Serial1/1.34
i L2 167.1.45.0/27 [115/20] via 167.1.135.5, Serial1/0
C 167.1.13.0/24 is directly connected, Serial1/2
150.1.0.0/24 is subnetted, 5 subnets
i L2 150.1.6.0 [115/20] via 204.12.1.6, FastEthernet0/0
i L2 150.1.5.0 [115/20] via 167.1.135.5, Serial1/0
i L2 150.1.4.0 [115/20] via 167.1.34.4, Serial1/1.34
C 150.1.3.0 is directly connected, Loopback0
i L2 150.1.1.0 [115/20] via 167.1.13.1, Serial1/2
[115/20] via 204.12.1.1, FastEthernet0/0
[115/20] via 167.1.135.1, Serial1/0
R5-Config
interface Serial0/0
ip address 167.1.135.5 255.255.255.0
ip router isis
encapsulation frame-relay
frame-relay map clns 503 broadcast
frame-relay map ip 167.1.135.1 503
frame-relay map ip 167.1.135.3 503 broadcast
no frame-relay inverse-arp
router isis
net 00.3490.0001.0001.0005.00
is-type level-2-only
R5# show clns neighbors
System Id Interface SNPA State Holdtime Type Protocol
R3 Se0/0 DLCI 503 Up 24 L2 IS-IS
R5# show clns is-neighbors
System Id Interface State Type Priority Circuit Id Format
R3 Se0/0 Up L2 64 R5.02 Phase V
R5#
R5#Show ip route
Gateway of last resort is not set
i L2 204.12.1.0/24 [115/20] via 167.1.135.3, Serial0/0
167.1.0.0/16 is variably subnetted, 6 subnets, 2 masks
C 167.1.135.0/24 is directly connected, Serial0/0
i L2 167.1.34.0/24 [115/20] via 167.1.135.3, Serial0/0
C 167.1.45.0/27 is directly connected, BRI0/0
C 167.1.58.0/24 is directly connected, FastEthernet1/0
C 167.1.5.0/24 is directly connected, Ethernet0/0
i L2 167.1.13.0/24 [115/20] via 167.1.135.3, Serial0/0
150.1.0.0/24 is subnetted, 5 subnets
i L2 150.1.6.0 [115/30] via 167.1.135.3, Serial0/0
C 150.1.5.0 is directly connected, Loopback0
i L2 150.1.4.0 [115/30] via 167.1.135.3, Serial0/0
i L2 150.1.3.0 [115/20] via 167.1.135.3, Serial0/0
i L2 150.1.1.0 [115/30] via 167.1.135.3, Serial0/0
R5#ping 150.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 150.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 88/89/92 ms
R5#
R1-Config
interface Serial0
ip address 167.1.135.1 255.255.255.0
ip router isis
encapsulation frame-relay
clockrate 64000
frame-relay map clns 103 broadcast
frame-relay map ip 167.1.135.3 103 broadcast
frame-relay map ip 167.1.135.5 103
no frame-relay inverse-arp
router isis
net 00.3490.0001.0001.0001.00
is-type level-2-only
System Id Interface SNPA State Holdtime Type Protocol
R3 Se0 DLCI 103 Up 27 L2
IS-IS
R3 Et0 000d.bc16.61e0 Up 7 L2
IS-IS
R6 Et0 0008.21f0.2e30 Up 29 L2
IS-IS
R3 Se1 *HDLC* Up 29 L2
IS-IS
R1#show clns is-neighbors
System Id Interface State Type Priority Circuit Id Format
R3 Se0 Up L2 64 R5.02 Phase
V
R3 Et0 Up L2 64 R3.01
Phase V
R6 Et0 Up L2 64 R3.01
Phase V
R3 Se1 Up L2 0 00
Phase V
Gateway of last resort is not set
C 204.12.1.0/24 is directly connected, Ethernet0
167.1.0.0/16 is variably subnetted, 4 subnets, 2 masks
C 167.1.135.0/24 is directly connected, Serial0
i L2 167.1.34.0/24 [115/20] via 204.12.1.3, Ethernet0
[115/20] via 167.1.13.3, Serial1
[115/20] via 167.1.135.3, Serial0
i L2 167.1.45.0/27 [115/30] via 167.1.135.3, Serial0
[115/30] via 204.12.1.3, Ethernet0
[115/30] via 167.1.13.3, Serial1
C 167.1.13.0/24 is directly connected, Serial1
150.1.0.0/24 is subnetted, 5 subnets
i L2 150.1.6.0 [115/20] via 204.12.1.6, Ethernet0
i L2 150.1.5.0 [115/30] via 167.1.135.3, Serial0
[115/30] via 204.12.1.3, Ethernet0
[115/30] via 167.1.13.3, Serial1
i L2 150.1.4.0 [115/30] via 204.12.1.3, Ethernet0
[115/30] via 167.1.13.3, Serial1
[115/30] via 167.1.135.3, Serial0
i L2 150.1.3.0 [115/20] via 204.12.1.3, Ethernet0
[115/20] via 167.1.13.3, Serial1
[115/20] via 167.1.135.3, Serial0
C 150.1.1.0 is directly connected, Loopback0
R1#ping 150.1.5.5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 150.1.5.5, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 56/112/269 ms
R1#
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