[nsp] Connecting Max6000 with Cisco 2500 over HDSL: "line protocolis down"

[Gert Doering]

Hi,

On Fri, Jun 25, 2004 at 10:43:33AM -0700, Bruce Pinsky wrote:
> | And current interface config is as follows.
> | Current configuration : 123 bytes
> | !
> | interface Serial0
> |  no ip address
> |  encapsulation ppp
> |  ppp authentication chap callin
> |  ppp chap password 7 1248574446
> | end
> 
> [..] You will also need
> to have an IP address on the serial interface and on the ascend if you want
> to ping the interface.

Uh.  Didn't notice that on the original post.

"no ip adress" will actually disable IP processing (including PPP/IPCP)
on that interface - you need "ip unnumbered <something>" or an explicit
IP address.  Otherwise the interface will happily do CDP, IPX, IPv6, ...
(whatever is available and configured) but *not* IP.

This is *not* related to the interface being "up/down", though - without 
IP address, but everything else being correct, the interface will come
up to "up/up" state, but then ignore all routing info configured to
it ("ip route ... serial0" will be visible in the config, but not have 
any effect) and not pass IP packets.

gert
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de