Re: MPLS TE Tunnel : Tunnel B/W doubt

What you are seeing is Load balancing across multiple TE tunnels for
prefixes reachable further down the tunnel. This is an expected behavior
with "autoroute announce". You can use "auto-bw" to dynamically control the
TE tunnel Bandwidth after tunnel setup.

Once tunnels are established (using CSPF), IGP considers the Tunnels as
always 1-hop (and always prefers over any other IGP 1-hop path). You can
load balance upto 8,16, or 32 TE paths as supported by the platform.

On Sat, Jan 28, 2012 at 10:13 AM, Sonu Khandelwal <sonu.kwl_at_gmail.com>wrote:

> [image: Boxbe] <https://www.boxbe.com/overview> Sonu Khandelwal (
> sonu.kwl@gmail.com) is not on your Guest List<https://www.boxbe.com/approved-list>| Approve
> sender <https://www.boxbe.com/anno?tc=10557674166_204049186> | Approve
> domain <https://www.boxbe.com/anno?tc=10557674166_204049186&dom>
>
> on interface it means how much bandwidth can be reserved by RSVP.
> on tunnel it means, how much bandwidth is required by tunnel.
>
> Hope it helps.
>
> Thanks,
> Sonu
>
> On Sat, Jan 28, 2012 at 11:37 PM, GAURAV MADAN <gauravmadan1177_at_gmail.com
> >wrote:
>
> > Then what does "rsvp bandwidth <> " on interface does ?
> > That is also a constraint on interface to establish the tunnel .. right ?
> >
> > How do you differentiate between the BW that we specify on interface
> level
> > and the one that we specify on interface tunnel ?
> >
> > Thnx
> > Gaurav Madan
> >
> > On Sat, Jan 28, 2012 at 9:23 PM, Paul Negron <negron.paul_at_gmail.com>
> > wrote:
> >
> > > 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
> > > >
> > > >
> > > > Blogs and organic groups at http://www.ccie.net
> > > >
> > > >
> _______________________________________________________________________
> > > > Subscription information may be found at:
> > > > http://www.groupstudy.com/list/CCIELab.html
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Sat Jan 28 2012 - 11:02:47 ART