MPLS TE and ISIS

Dear all,

I have an interesting issue here with MPLS TE and ISIS. I have four
routers, R1, R2, R3 and R4.

R1-------R2-------R3---------R4

R1 and R2 are in ISIS level 1 (router isis)
R2 and R3 are in ISIS level 2 (router isis SECOND)
R3 and R4 are in ISIS level 1 (router isis)

i have created tunnel on R1 with explicit path:

R1->R2->R3->R4

I have redistributed the connected link between R2 and R3 from ISIS
level 2 SECOND (router isis SECOND) into ISIS level 1 (router isis)
which is working fine and on R1 and R4 i get that connected (x.x.23.0)
link as iL1. The issue is tunnel is up and down.

But as soon as i put the connected link between R2 and R3 (interface
FastEthernet0/0.23) in ISIS level 1 (router isis) tunnel is up up and
it works fine. Any idea why it was not working before?

here are the configs:

R1:

tinterface Tunnel10
 ip unnumbered Loopback0
 tunnel destination x.x.x.4
 tunnel mode mpls traffic-eng
 tunnel mpls traffic-eng autoroute announce
 tunnel mpls traffic-eng priority 0 0
 tunnel mpls traffic-eng bandwidth 2000
 tunnel mpls traffic-eng path-option 1 explicit name CISCO

router isis
 net x.x.x.x
 is-type level-1
 metric-style wide
 mpls traffic-eng router-id Loopback0
 mpls traffic-eng level-1

R2:

router isis
 net x.x.x.x
 is-type level-1
 metric-style wide
 redistribute connected route-map CONN level-1
 mpls traffic-eng router-id Loopback0
 mpls traffic-eng level-1

router isis SECOND
 net x.x.x.x
 is-type level-2-only
 metric-style wide
 mpls traffic-eng router-id Loopback1
 mpls traffic-eng level-2

interface FastEthernet0/0.23
 encapsulation dot1Q 23
 ip address x.x.23.2 255.255.255.0
 ip router isis SECOND
 mpls traffic-eng tunnels
 mpls ip
 ip rsvp bandwidth 20000

ip access-list standard CONN
 permit x.x.23.0

route-map CONN permit 10
 match ip address CONN

R3:

router isis
 net x.x.x.x
 is-type level-1
 metric-style wide
 redistribute connected route-map CONN level-1
 mpls traffic-eng router-id Loopback0
 mpls traffic-eng level-1

router isis SECOND
 net 49.0010.0000.0000.2222.00
 is-type level-2-only
 metric-style wide
 mpls traffic-eng router-id Loopback1
 mpls traffic-eng level-2

interface FastEthernet0/0.23
 encapsulation dot1Q 23
 ip address x.x.23.3 255.255.255.0
 ip router isis SECOND
 mpls traffic-eng tunnels
 mpls ip
 ip rsvp bandwidth 20000

ip access-list standard CONN
 permit x.x.23.0

route-map CONN permit 10
 match ip address CONN

thanks,
Aamir

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Received on Thu Dec 02 2010 - 01:34:30 ART