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=66464&t=66464 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
