frame-relay configuration options

looking at case study for frame-relay and not sure how to configure lmi DCE/DTE options.with cisco all i have to do is specify dte/dce side and also lmi type.

sample chapter2 case study Question.

R3
so-0/2/0
L2 100
Frame Relay,
ITU LMI,
15-second polls,
30-millisecond hold-time,
threshold/events ratio of 2:3 for line up or down

answer

so-0/2/0 {
hold-time up 30 down 30;
encapsulation frame-relay;
lmi {
n392dte 2;
n393dte 3;
t391dte 15;
lmi-type itu;
}
unit 100 {
dlci 100;
family inet {
address 10.0.2.5/30;

R4 side

so-0/1/0 {
dce;
hold-time up 30 down 30;
encapsulation frame-relay;
lmi {
n392dce 2;
n393dce 3;
t392dce 25;
lmi-type itu;
}
unit 100 {
dlci 100;
family inet {
address 10.0.2.6/30;
}
my question is about these config options below and how to find which is which(DTE/DCE).
R3
lmi {
n392dte 2;
n393dte 3;
t391dte 15;
lmi-type itu;

R4
lmi {
n392dce 2;
n393dce 3;
t392dce 25;
lmi-type itu;
root@R1# set lmi ?
Possible completions:
+ apply-groups Groups from which to inherit configuration data
+ apply-groups-except Don't inherit configuration data from these groups
lmi-type Specify the Frame Relay LMI type
n391dte DTE full status polling interval (1..255)
n392dce DCE error threshold (1..10)
n392dte DTE error threshold (1..10)
n393dce DCE monitored event count (1..10)
n393dte DTE monitored event count (1..10)
t391dte DTE polling timer (5..30 seconds)
t392dce DCE polling verification timer (5..30 seconds)
[edit interfaces so-0/0/0]
this is something i need to know and expect to configure in JNCIP lab?

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Comments

Aldur

densma wrote: »

R4 side

so-0/1/0 {
dce;

That's all you need to configured a side as DCE. All the other 'DCE' config is for LMI only and is not required to set an interface as the DCE.

densma

so i guess the lab is probably back-to-back connection?

Aldur wrote: »

That's all you need to configured a side as DCE. All the other 'DCE' config is for LMI only and is not required to set an interface as the DCE.

Aldur

densma wrote: »

so i guess the lab is probably back-to-back connection?

heh, can't really comment on that without breaking NDA. However it would be hard to emulate LMI in a lab setting but not impossible

densma

thanks!

Aldur wrote: »

heh, can't really comment on that without breaking NDA. However it would be hard to emulate LMI in a lab setting but not impossible

densma

how do you know DCE side?

Aldur wrote: »

That's all you need to configured a side as DCE. All the other 'DCE' config is for LMI only and is not required to set an interface as the DCE.

Aldur

densma wrote: »

how do you know DCE side?

In what interface context? For anything discussed in the JNCIP book there is no hardware determined DCE side. Serial cables of course will have a DCE side in a lab environment but SONET will not.

For example a SONET interface that is running FR in a lab situation will require you to set one side as DCE via the CLI but it won't matter which side you set.

HTH