[c-nsp] Question on ISIS Cisco

[Olivier CALVANO]

Hello,

I'm looking for information on configuring ISIS
on cisco 6500/Sup720-3BXL:

I have two Cisco 6500/Sup720-3BXL connected by
Layer 2 link of 1 Gbit.

My config:

C6500-1:

interface GigabitEthernet1/2
mtu 2000
 ip address 192.168.100.1 255.255.255.252
 ip router isis
 speed nonegotiate
mpls label protocol ldp
 tag-switching ip
 clns mtu 1500

router isis
 net 49.0001.0000.0000.0424.00
 is-type level-2-only
 metric-style wide
 redistribute connected




C6500-2:

interface GigabitEthernet3/2
mtu 2000
 ip address 192.168.100.2 255.255.255.252
 ip router isis
 speed nonegotiate
mpls label protocol ldp
 mpls ip

router isis
 net 49.0001.0000.0000.0421.00
 is-type level-2-only
 metric-style wide
 redistribute connected
 !




Soon, I will add a new link between the two for backup.
This link is on port Gigabit but there are only 100 Mbits of Commit
I would like the cisco C6500 use it only on the 1 Gb link does not work
more.

I will add in config:

C6500-1:

interface GigabitEthernet1/3
mtu 2000
 ip address 192.168.50.1 255.255.255.252
 ip router isis
 speed nonegotiate
mpls label protocol ldp
 tag-switching ip
 clns mtu 1500


C6500-2:

interface GigabitEthernet3/3
mtu 2000
 ip address 192.168.50.2 255.255.255.252
 ip router isis
 speed nonegotiate
mpls label protocol ldp
 mpls ip


How can I do to make it a priority is having an link compared to another?

Thank you in advance
Olivier