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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