Re: MPLS TE Tunnel : Tunnel B/W doubt

The bandwidth is a constraint. It only says " I need 60K of bandwidth in
order to establish this tunnel". One tunnel requires 60K and the other
requires 70K. If the bandwidth is available for both, they will both be
established. That "bandwidth" constraint has nothing to do with the cost of
the tunnel for route selection.

-- 
Paul Negron
CCIE# 14856 CCSI# 22752
Senior Technical Instructor
> From: GAURAV MADAN <gauravmadan1177_at_gmail.com>
> Reply-To: GAURAV MADAN <gauravmadan1177_at_gmail.com>
> Date: Sat, 28 Jan 2012 20:44:46 +0530
> To: Cisco certification <ccielab_at_groupstudy.com>
> Subject: MPLS TE Tunnel : Tunnel B/W doubt
> 
> Hi All
> 
> I am running in some issue to understand how Tunnel Bandwidth works .
> 
> Topology
> ---------
> 
> R1                       R4
> |                              |
> |                             |
> R2-----------------R3
> 
> R1 is head end of tunnel . It has 2 tunnels Tunnel0 and Tunnel 1 as follows
> :
> 
> R1#sh run int tun 0
> Building configuration...
> 
> Current configuration : 284 bytes
> !
> interface Tunnel0
>  ip unnumbered Loopback0
>  tunnel mode mpls traffic-eng
>  tunnel destination 4.4.4.4
>  tunnel mpls traffic-eng autoroute announce
>  tunnel mpls traffic-eng priority 7 7
>  tunnel mpls traffic-eng bandwidth 70
>  tunnel mpls traffic-eng path-option 1 dynamic lockdown
> end
> 
> R1#sh run int tun 1
> Building configuration...
> 
> Current configuration : 284 bytes
> !
> interface Tunnel1
>  ip unnumbered Loopback0
>  tunnel mode mpls traffic-eng
>  tunnel destination 4.4.4.4
>  tunnel mpls traffic-eng autoroute announce
>  tunnel mpls traffic-eng priority 7 7
>  tunnel mpls traffic-eng bandwidth 60
>  tunnel mpls traffic-eng path-option 1 dynamic lockdown
> 
> 
> 
> Now ; one tunnel has bandwidth of 70Kbps and other has of 60Kbps .
> Following is my show ip route ospf output :
> 
>       4.0.0.0/32 is subnetted, 1 subnets
> O        4.4.4.4 [110/4] via 4.4.4.4, 00:05:52, Tunnel1
>                  [110/4] via 4.4.4.4, 00:05:52, Tunnel0
> 
> I see both entries  there ...
> 
> Is there a reason for this ?
> Please let me know .. I think that it should be routing via Tunnel 0 only .
> 
> Thanks
> Gaurav Madan
> 
> 
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