From: Philip Lai (philip@xxxxxxxxxxx)
Date: Sun Oct 29 2000 - 02:08:31 GMT-3
Hi,
When I reading SAP type in
http://www.cisco.com/warp/customer/698/acl200.html , it list all the sap
type there.
I am wondering what the the meaning for the sap type for 00 and 01. Are they
the explorer frame or the command and respond ? Will the explorer frame have
a fixed value of sap type ?
________
Another point to consider when designing the ACL is that SAP values change
depending on if they are commands or responses. The SSAP includes the
command/response (C/R) bit to differentiate between them. The C/R is set to
0 for commands and to 1 for responses. Therefore, the ACL must allow or
block commands as well as responses. For example, sap 0x05 (used for
responses) is just SAP 0x04 with the C/R set to 1. The same applies to sap
0x09 (sap 0x08 with C/R set to 1), 0x0D, and 0x01.
Thanks
Philip Lai
NCR HK Email: philip.lai@ncr.com
Phone: (852) 2859-6076 Fax: (852) 2294-3055
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