From: Giblin Dean L. (dlgiblin@xxxxxxxx)
Date: Mon Mar 04 2002 - 16:25:53 GMT-3
I have been reading about and working on several Frame-Relay labs. I have a co
uple specific questions pertaining to practice labs, and a general question at
the end.
Solie's Book - Lab 13, pg 378-381
When I compared my answer to the lab configurations I found a couple of discrep
ancies listed below. The statements with * were not in my configurations.
Hostname scotts_house
Interface serial0
* No arp frame-relay
* No frame-relay inverse-arp
Insturctions read, "Prevent dynamic mapping of the PVC between scotts_houst and
mini_me. I did not interpret this prevent all dynamic mapping on the PVC. Pe
r Caslow, frame-relay map statements disable inverse-arp for both the protocol
and the dlci. This circuit was configured with relay map statements. What am
I overlooking??
The same held true for interface Serial0 on router mini_me.
On the Starbucks_90210 router serial0 interface I did not include the frame-rel
ay interface-dlci 131 command. Per Caslow, "Frame-Relay interface-DLCI stateme
nts are useless in a physical interface only configuration ..." Am I missing so
mething here?
Solie's Book - Lab 14
This lab requests traffic shaping be enable to prevent the T1 circuit from over
running a 64k CIR circuit.
In the configuration example on page 391 the answer is shown as placing a "fram
e-relay class 64k" statement on the Serial0.1 interface with the map-class defi
ned elsewhere. Per Caslow pg 811 this would provide Generic Traffic Shaping (G
TS) which from my understanding would impact all transmission across this inter
face including the other T1 <-> T1 interface on the multipoint interface. Page
812 of Caslow explains how to implement Frame-Relay Traffic Shaping (FRTS) and
recommends placing this command within the definition of the frame-relay inter
face-dlci command so that the 64k traffic shaping policy will only apply to the
one circuit. Am I being too picky or am I missing the big picture?
General Question - I believe I am starting to get a handle on the configuration
of Frame-Relay circuits. However when I start a lab and the lab does not spec
ifically state the type of interface, physical or sub-interface, and there are
no requirements that require one type of interface or the other which is the be
tter interface to use (for the lab exam) that is. I understand the inherent be
nefit of the sub interface, however on some labs I generate a working configura
tion go to check my answer only to find they used an alternate solution. Do yo
u have advise as to how to isolate the best way to make this determination?
TIA,
Dean
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