----- Original Message -----
From: Mr. Oletu Hosea Godswill, CCNA
To: Ronny Jonathan
Sent: Monday, May 07, 2001 6:18 PM
Subject: Re: Layer 3 Switching Flow Mask [7:3360]
> Me think since MLS has to do with layer 2 up to layer 4. We know that
layer
> 4 has ports numbers and all that. Ordinary if the ports numbers at layer 4
> at not made used of, MLS has not been accomplished. Access-list or
something
> have to be configured so that layer 4 element are used in the decision
> making. Since this is the basic defination of MLS, it then means Flow mask
> is an additional thing.
>
> I agree with what the cisco press book said, if you say
> set mls flow destination
> (only destination informations will be kept in the mls cache)
> or if you say
> set mls flow destination-source
> (both source and destination ip-addresses will be kept in the mls cache)
> better stil
> set mls flow full
> (All informations including port numbers will be documented in the cache)
>
> Good luck,
> (Also preparing for BCMSN)
>
> my 2 cents.
> Oletu
>
>
>
> ----- Original Message -----
> From: Ronny Jonathan
> To:
> Sent: Sunday, May 06, 2001 12:10 PM
> Subject: Layer 3 Switching Flow Mask [7:3360]
>
>
> > Hi All,
> >
> > In BCMSN course book (Cisco Press) p233, it is stated that:
> > "Most Cisco documentation explains flow masks as a way to determine how
> > packets are compared to entries in the MLS cache. This is inaccurate.
Flow
> > masks are actually used to determine how much information about the
packet
> is
> > placed in the MLS cache. The flow mask is not used to compare packets to
> > existing entries in the MLS cache"
> >
> > But from another source (Boson & Cisco Doc):
> > "you are introducing policy based routing and want to route differently
> based
> > on source, destination, and port number. What command would you use on a
> > multi-level switch to make it consider port numbers when layer 3
> forwarding ?
> > the correct syntax is: set mls flow
[destination|destination-source|full].
> >
>
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/rel_5_2/layer3/m
> l
> > s.htm#xtocidll0l940"
> >
> > So the command "set mls flow ...", is it only to determine what
> information
> > to
> > be kept in the mls entry or is it meant to enforce so that all packets
> going
> > through the L3 switch will be compared to the mls entry according to the
> flow
> > mask that has been set up by the "set mls flow" command ?
> >
> > Thanks in advance for the answer, I need it for BCMSN exam on Wednesday.
> >
> > Regards,
> > Ronny
> > FAQ, list archives, and subscription info:
> http://www.groupstudy.com/list/cisco.html
> > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
>
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