Re: [mpls-linux-general] Signification of some commands
Status: Beta
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jleu
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From: James R. L. <jl...@mi...> - 2005-06-16 02:18:56
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On Fri, Jun 10, 2005 at 04:25:47PM +0200, Bertrand Lemaitre wrote: > Hi, >=20 > Would it be possible to have the signification of the following instructi= ons ? Sorry for the long delay in responding, I've been forcing myself to work on ldp-portable, getting it to a work state. Hopefully more on that in a subsequent email ... >=20 > nffwd Allows for branching to a differnt NHLFE based on the NF mark of a packet. > nf2exp Converts a NF mark of a packet into the EXP at the current level of the sta= ck. > tc2exp Converts a tcindex on a packet into the EXP at the current level of the sta= ck. > ds2exp Converts the DSCP in the IP header into the EXP at the current level of the stack. > dsfwd Branches to a different NHLFE based on teh DSCP in the IP header of a packe= t. > exp2tc Converts EXP bits at the current level of the stack into a tcindex on a pac= ket. > exp2ds Converts the EXP bits at the current level of the stack into the DSCP in the IP header. >=20 > I think there is a link beteween the experimental bit, the quality and se= rvice. > Any help would be great. You are correct that these are there for implementing QoS or CoS. Specifically tcindex and NF mark can be used by iptables and/or tc to influence Layer 3 routing descisions (on a egress LER) or queuing descision= s. The EXP bits allow for propogating QoS or CoS info across a Forwarding Adjacency, hence the reason why these commands only affect the EXP at the current level of the stack. The *fwd operations allow for re-use of MPLS componetns (not always just reuse of the NHLFEs pointed to by the 'fwd', but also of the NHLFE or ILM which utilizes the 'fwd') Let me know if you have any specific questions of how to use these. One thing to note is that I have not tested these instructions in sometime so some code rot may have occured. >=20 > Thanks >=20 > Bertrand Lemaitre >=20 > ---------------------------------------------------------------- > This message was sent using IMP, the Internet Messaging Program. >=20 >=20 >=20 > ------------------------------------------------------- > This SF.Net email is sponsored by: NEC IT Guy Games. How far can you sho= tput > a projector? How fast can you ride your desk chair down the office luge t= rack? > If you want to score the big prize, get to know the little guy. =20 > Play to win an NEC 61" plasma display: http://www.necitguy.com/?r=3D20 > _______________________________________________ > mpls-linux-general mailing list > mpl...@li... > https://lists.sourceforge.net/lists/listinfo/mpls-linux-general --=20 James R. Leu jl...@mi... |