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Re: Specifying a particular route
The routing table is computed during the call to "run" (that "$ns run"
thing...), the method compute from route.cc: RouteLogic is called in
Simulator::compute-flat-routes in tcl/lib/ns-route.tcl; the routing table is
computed at the C++ level and the classifiers are populated at the OTcl level.
If you want to specify a particular route you need to either define your own
routing model (see the manual); or modify corresponding classifier entries. You
can access the classifier at each node by the method add-route { dst target };
the target must be a link's head, e.g. a link's point of entry.
In the case of LANs the ro7uting table gets looked-up every time a packet gets
sent; the look up is performed by a LanRouter object (lanrouter.cc) whose
behaviour could be modified to reflect your needs.
Recall that modifying the routing table by itself won't suffice if you don't
modify the classifiers accordingly (except for LANs).
> X-Authentication-Warning: mash.CS.Berkeley.EDU: majrdomo set sender to
[email protected] using -f
> Date: Mon, 14 Feb 2000 11:20:07 +0200 (SAST)
> From: Antoine Bagula <[email protected]>
> To: [email protected]
> cc: [email protected]
> Subject: Specifying a particular route
> MIME-Version: 1.0
>
> Dear Tarik and Christiane,
>
> I have seen a message from Eric Wong adressed to you about specification
> of a particular route. I don't know if you have answered or if you have
> any reply for Eric. If you do please copy me in your reply because i
> also have that problem. If there is any script in the /tcl/ex examples
> related to that topic , please inform me.
>
> Bagula.
>
>
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>
> ---------- Forwarded message ----------
> Date: Sat, 12 Feb 2000 01:35:26 +0800
> From: Eric Wong <[email protected]>
> To: Christiane <[email protected]>,
> Tarik Alj <[email protected]>,
> [email protected]
> Subject: Specifying a particular route
>
> Hi,
>
> Can I ask if it is possible to define specific path between 2 pairs of
> source and destinations nodes with the current ns2.1b5?
>
> This is what I am trying to get.
>
> bs1 bs2
> \ /
> s1 r1--r2--r3 d1
> \ / \ / \ /
> r0-----r4-----r5
> / / \ \
> s2 bd1 bd2 d2
>
>
> That is for s1 and s2 I want them to follow a specific path to d1 and d2
> respectively.
> i.e. s1 -> r0 -> r1 -> r2 -> r3 > r5 -> d1
> s2 -> r0 -> r4 -> r5 -> d2
>
> While for sources bs1 and bs2 to destination bd1 and bd2, they follow the
> normal shortest path route.
>
> Is there any way of defining an expilcite path? I know that this can be done
> by using
> $n1 add-route-to-adj-node -default $r1
>
> however to use this I have to turn off routing $ns rtproto Manaul however, I
> still need routing for the source bs1 and bs2?
>
> Is the anyway I can do to add my own routing entries? What changes can I
> make to the curent classifier such that it can define it's own path yet
> keeping it's original capability?
>
> any info is greatly appreciated. thanks.
>
> Thanks.
> Eric
>
>
>
>
Tarik