Hi Priscilla, Your suspicion is 100% correct: the flow mask is signaled from the router (RP) to the switch (SE) via the MLSP protocol.
Take care, Kennedy Priscilla Oppenheimer wrote: > > With Multilayer Switching (MLS), how does the MLS Switch > (MLS-SE) know that the router (MLS-RP) has an access list? In > other words, how does the switch know that it should use a > destination flow mask, a destination-source flow mask, or a > full-flow mask? The access list, afterall, is on the router, > not the switch, according to descriptions of MLS. > > The switch definitely knows, because you see different output > with the "show mls" command, but how does it know? Does the > router pass it to the switch in MLSP messages, or is there > something more obvious that I'm missing. > > With some access lists, an enable packet would never come back > from the router. Is that what triggers the switch to use the > more advanced flow masks? This would imply that the switch is > always looking at upper layers and knows that Telnet between 2 > hosts results in an enable packet but FTP (or whatever) does > not. That seems like a lot of burden to put on a switch. > > I checked Clark and Hamilton "Cisco LAN Switching," and the > Ethernet LAN switching papers at CertificationZone, but am > still left wondering.... > > Thanks for your help. > > Priscilla > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=66469&t=66464 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
