According to your statement when the token comes back to station A (we assume X was
the destination), A creates a new token with priority 4 and no reservation set.
Is that a fair assesment of your response?
[Pierre-Alex] -----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Friday, January 12, 2001 4:12 PM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: RE: CCIE Case Scenario
I found in the Roosevelt Giles: All-in-one Cisco CCIE study guide the following
statement
The three bits RRR, are the reservation bits. These bits are initially set to 0 by
any transmitting station. So, when the currently circulating frame is returned to the
originating station and a new token is generated, the PPP bits, the priority bits, are
set to the RRR bits value.
The following statement is my interpretation of the next paragraph: It goes on to say
that a controller looks at the T (token bit) and the PPP (priority bits) to determine
if it can seize the token and transmit data. There is no mention of looking at the RRR
bits to determine if a controller can seize the token.
-----Original Message-----
From: Pierre-Alex GUANEL [mailto:[EMAIL PROTECTED]]
Sent: Friday, January 12, 2001 4:03 PM
To: [EMAIL PROTECTED]
Subject: CCIE Case Scenario
I've been on it since 4am. Still can't figure that one out ...
>From Cisco:
"After the token is claimed and changed to an information frame, only stations with
priority higher than the trasmitting station can reserve the token for the next pass
around the network. When the next token is generated, it includes the highest priority
of the reserving station. Stations that raise a token's priority level must reinstate
the previous lower priority level after their transmission is complete"
CASE SCENARIO:
I have 3 stations: A , B, and C Their resective priorities are 1 , 4, and 5. Station X
Y Z have priority 0
Station A grabs the token (the priority at the time was 0) and put data on it. While
it goes around the ring, station B reserves the token for itself. When the token comes
back to station A (we assume X was the destination), A creates a new token with
priority 4 and no reservation set.
QUESTIONS:
Question: Is the last statement of my case scenario correct or is it the other way
arround? (A creates a new token ring with the previous priority: 0 and set the
reservation to 4).
DIAGRAM: The ring
A-------W---B--------C----X-
|--------Z-------Y---------|
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