From: Kenneth Wygand (KWygand@customonline.com)
Date: Wed Apr 21 2004 - 15:39:20 GMT-3
If I set DSCP on all telnet traffic out port FastEthernet0/0, what
command (show/debug) can I use to determine if traffic leaving this
interface is marked? I'm using an outbound service policy on the
interface.
Also, if I want to mark all ICMP traffic generated by the router with a
particular DSCP value, how can I do this? I tried doing this with a
local-policy route-map, but I did not have the option of setting DSCP
through this method (I can set IP Precedence or IP TOS, but the TOS is
"max reliability/throughput, min delay/monetary-cost"). Are these TOS
values considered "legacy" as compared with DSCP.
This is one thing that confuses me. There are 8 bits in the IP header
for TOS. When flagging "max reliability/throughput, min
delay/monetary-cost", how does the receiving device know that this is
not a DSCP value? There is no "switch" that tells the receiving device
which implementation is used, so is there any correlation? I know DSCP
is backwards compatible with IP precedence due to the assignment of the
first three bits in the DSCP value as "priority". I don't understand
the TOS/DSCP correlation though. Is it only appropriate to use a single
implementation (legacy TOS vs. DSCP) throughout your entire domain?
Sorry for the conglomerate of questions here... just beginning the
mental breakdown before exam time on Monday... errr....
Kenneth E. Wygand
Systems Engineer, Project Services
CISSP #37102, CCNP, CCDP, ACSP, Cisco IPT Design Specialist, MCP, CNA,
Network+, A+
Custom Computer Specialists, Inc.
"I am not really smart. I just stick with problems longer."
-Albert Einstein
Custom Computer Specialists, Inc.
"Celebrating 25 Years of Excellence"
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