[c-nsp] Cisco 828 / 878 (SHDSL) config example (Optus XYZed DSLAM maybe?)

[Code Monkey]

On 4/19/06, Skeeve Stevens <skeeve at skeeve.org> wrote:
> Hey all,
>
> If anyone has a barebones config for a Cisco 828 (SHDSL) which will be
> connected to Optus XYZed DSLAM, that would be awesome.

You means 878, right? Going from the rest of your mail:

> I've done many 828's - even 877's. but this is the first 878 and apparently
> it has funky things like controller dsl0/0/0 and stuff.

If 878, then this should get you started, but watch out for the notes below:

controller DSL 0
 mode atm
 line-term cpe
 line-mode auto
 dsl-mode shdsl symmetric annex A
 line-rate auto
!
interface ATM0
 no ip address
 no shutdown
 no atm ilmi-keepalive
!
interface ATM0.1 point-to-point
 ip address 192.168.254.1 255.255.255.252
 no shutdown
 pvc 8/35
  encapsulation aal5snap
!
interface FastEthernet0
 no ip address
 no shutdown
!
interface FastEthernet1
 no ip address
 no shutdown
!
interface FastEthernet2
 no ip address
 no shutdown
!
interface FastEthernet3
 no ip address
 no shutdown
!
interface Vlan1
 ip address 192.168.0.254 255.255.255.0
!

NOTES !

The dsl-mode is region-dependent, don't know what it's supposed to be
in Australia, but you have the same thing on 828s.

The line-rate auto thing is <expletive censored>:

1) The CLI doesn't accept it unless the CD is OK, and putting it in
resets the interface, so you hang for a minute. If you want to
configure it without CD being up, you have to copy the config from the
network.

2) If you don't use it, you have to set a numerical value that is
equal or bigger than the actual value.

3) Sometimes with a 1280 kb line rate, configured as line-rate 2304 in
startup-config, the line does not go up. Connecting by other means
shows startup-config line-rate 2304, but running-config line-rate
1152. Rebooting doesn't help. Putting back line-rate 2304 works
immediately.

4) When you put auto, the line-rate is auto-detected and adjusted in
running-config, so a write mem will remove the auto and put in the
numerical value.

5) I have SDSL lines that are sometime detected as 1152 and most often as 1280.

The combination of all this is hell. I don't see any way to have a
reasonable configuration that won't lock up!

I don't see any reason either for the thing to exist, as I see it the
878 can manage to sync without knowing the desired rate, so why should
one have to specify the line-rate, and if one has to specify the
line-rate and one puts "auto", why does "auto" get replaced by numbers
at write mem time!? In a nutshell, why not sync if syncing is
possible, absent some very explicit operator requirement! I could
understand "do not sync below this rate", but this is "do not sync
*above* this rate", how is that useful anyway?

If anyone has an idea on configuring so that 878 will always sync,
even when someone changed something irrelevant, wrote mem, and power
was lost a month later, please tell.