MPLS TE issue

From: HEMANTH RAJ <hemanthrj_at_gmail.com>
Date: Fri, 8 Nov 2013 18:28:14 +0530

HI

I have set up two TE Tunnels in my network with B.W for one tunnel is 110
Mbps and B.W for second tunnel is 10 mbps

 R1----- R2------R3-------R4

I am forming two TE tunnels from R1 to R4.

The max B.W available between routers R1 and R4 is 120 Mbps . Control Plane
reservation of two TE tunnels is TE1 110 Mbps and TE2 10 Mbps respectively

If i am sending 80 MBps of traffic in TE1 tunnel at x amount of time ,
During that time, i can utilize the remaining 40 Mbps in TE2 tunnel ( even
though i reserved only 10 Mbps in Control Plane , i can send 40 Mbps of
traffic in Data plane )

Now if i increase the rate of traffic in TE1 tunnel from 80 Mbps to 110
Mbps , automatically my TE2 tunnel traffic gets affected from 40 Mbps to 10
Mbps

My question here is how does the routers R2 and R3 know in Forwarding Plane
that Tunnel TE2 packtes should be dropped.

Forwarding Plane ( FIB ) doesnt hold the TE2 or TE1 B.W. allocation
information at all.
I have verified on the Forwarding Plane on the Line cards, i dont see any
Forwarding information of TE tunnel B.W. is programmed. How does the
Routers correctly drop the TE2 tunnels packet and not TE1.

BTW, i am using ASR9k as my R2 and R3 ,..

One more, if i explicitly configure QOS policies, all the Rate limiting,
Queuing policies will get automatically downloaded to Line Cards, I am
wondering whether MPLS TE TED information will be passed on to the Line
Cards but will not be able to see .

-- 
Regards
Hemanth Raj
CCIE#28593 (R&S)
Blogs and organic groups at http://www.ccie.net
Received on Fri Nov 08 2013 - 18:28:14 ART

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