From: Kevin Mahler (kemahler@xxxxxxxxx)
Date: Tue May 01 2001 - 11:11:47 GMT-3
Actually, the router won't allow you to set the clock rate on an interface
that is not DCE.
r4#sh cont serial 0
HD unit 0, idb = 0x193594, driver structure at 0x198A28
buffer size 1524 HD unit 0, V.35 DTE cable
cpb = 0x4, eda = 0xC0C8, cda = 0xC0DC
RX ring with 16 entries at 0x404C000
r4#config t
Enter configuration commands, one per line. End with CNTL/Z.
r4(config)#int s0
r4(config-if)#clock rate 64000
%Error: This command applies only to DCE interfaces
r4(config-if)#
As for why the PPP encapsulation is not working, I'd look into something
else. In my experience, just set up encap PPP and away you go. Of course
you do need to set the clock rate on the DCE side. I have two routers in
my lab running this way today. Here are the serial configs just in case
you want to try this and see if your's stays up.
Kevin
R4
interface Serial1
ip address 137.9.60.1 255.255.255.252
no ip directed-broadcast
ip pim sparse-dense-mode
encapsulation ppp
clockrate 64000
!
R5
interface Serial0
ip address 137.9.60.2 255.255.255.252
no ip directed-broadcast
ip pim sparse-dense-mode
encapsulation ppp
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Walter Chen
Sent: Tuesday, May 01, 2001 9:05 AM
To: 'HD4O'; ccielab@groupstudy.com
Subject: RE: PPP encapsulation in Serial Line
Configure the same clock rate on both sides and the link should be up. For
HDLC, you only need clock rate from the DCE side. For PPP, you need it on
both sides.
-----Original Message-----
From: HD4O [mailto:whoamijiny@hanmail.net]
Sent: Tuesday, May 01, 2001 5:16 PM
To: ccielab@groupstudy.com
Subject: PPP encapsultation in Serial Line
Team..
I have some problem with ppp encapsultion on Serial line in my Router..
When I use HDLC , there was no problem but after I changed encapsultion
mode to PPP ..I have following problems...
1. sometimes link was down ..so couldn't ping between neighbor routers
: change encap mode from PPP to HDLC ..it work fine and after I can
ping.. change again to PPP. Neighbor router can ping each other.
2. There is 32bit mask network like (C 133.2.50.6/32...<<- R6's serial
ip.) in my R5's Routing Table
(R5)133.2.50.5[s1] -------ppp-----------[s1] 133.2.50.6 (R6)
3. when I configure IPX networking...disconnect problem again...
Do you have any recommand with PPP encapsulation on Serial Line ?
I just use "encapsultion ppp " command in my serial interface.
Thanks in advance.
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