[c-nsp] Traffic engineering

[Oliver Boehmer (oboehmer)]

Robert Hass <> wrote on Sunday, December 04, 2005 2:14 PM:

> This is my network diagram:
> 
>                          stm-1                    fe
>                _____________________________    _______Customer1
>               /                             \  /
> Upstream____R1                               R4
>          ge   \________R2_________R3________/  \_______Customer2
>                  stm-1     stm-1      stm-1       fe
> 
> 
> I have two 100Mb customers connected via FastEthernet links to R4
> router. Traffic from internet to these customers is going through
> STM-1 connection between R1 and R4 routers. If both customers in one
> time want full 100Mb traffic from Internet the STM-1 connection will
> be overbooked (200Mb needed VS 155Mb available).
> 
> Is it possible to push 50-60Mb/s (maybe 10 of 20 prefixes announced by
> Customer2) from R1 to R4 via R2+R3 ? On path R1 to R4 via R2+R3 we
> have about 70-80Mb/s free bandwidth. Can anyone propose us solution ?

either modify your IGP metrics on the R1-R2-R3-R4 path so R1 will see R4
via both paths  and perform load-sharing (could create other problems in
your network, especially if the above drawing is incomplete), or better
use MPLS traffic-engineering and create two autoroute MPLS-TE tunnels
between R1 and R4 and load-share this way. These TE tunnels are local to
R1, so other routers in your IGP don't know about them..

	oli