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Bronze

MPLS TE

Can i create two MPLS TE tunnels from PE A to PE B with the same destination address as the loopback of PE B with "autoroute-announce" enabled being two tunnels have different explicit paths created ?

e.g

From PE A:

int lo0

ip address 10.10.10.1 255.255.255.255

int tu1

ip unnumbered loopback 0

tunnel mode mpls traffic-eng

tunnel destination 20.20.20.1

tunnel mpls traffic-eng autoroute-announce

int tu2

ip unnumbered loopback 0

tunnel mode mpls traffic-eng

tunnel destination 20.20.20.1

tunnel mpls traffic-eng autoroute-announce

PE B:

int lo 0

ip address 20.20.20.1 255.255.255.255

4 REPLIES
Cisco Employee

Re: MPLS TE

Yes you can. And you can even use unequal cost load balancing, if it is desired. You will need a tunnel bandwidth statement and CEF will be distributing the load acording to the reserved bandwidth ratio of the two tunnels. The routing table would contain two pathes to the destination networks routed across the tunnels. To make sure your IGP selects the tunnels as best path you might want to adjust the metric of the tunnels for IGP path selection:

int tu1

ip unnumbered loopback 0

tunnel mode mpls traffic-eng

tunnel mpls traffic-eng bandwidth 1000

tunnel destination 20.20.20.1

tunnel mpls traffic-eng autoroute-announce

tunnel mpls traffic-eng autoroute metric relative -1

The last command will ensure the tunnel is always slightly better than the physical interfaces towards the destination.

Hope this helps! Please rate all posts.

Regards, Martin

Silver

Re: MPLS TE

with this configuration, if you are having two paths for the same detination then the load balancing will occur. So the best is not to use autoroute announce. Instead of that you can use the tunnel priority. If one goes down second will come up.

regards

shivlu

Community Member

Re: MPLS TE

hello

you may get different result;

both tunnel can take the same path or take different path.

if your first tunnel doesn't leave enough bandwith on one link for the second tunnel, the second tunnel will find an other path (assuming they have the same priority).

to be sure to take different path, use 'explicit'

regards

etienne

Community Member

Re: MPLS TE

Hi,

Another way to proceed if you want both tunnels to be on different path without playing with bandwidth, is to use tunnel affinity.

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