cisco 876 WAN question

[mijondano]

Hi,

I own a cisco 876 I was using for an ADSL2+ over ISDN. Now, I'm switching to cable, meaning ethernet, not FTTH. I was wondering if I still could use this router for that, I mean, if I can configure one of the fast ethernet ports as a WAN port and use the other ports as LAN.

Thanks a lot in advance.

[Giuseppe Larosa · Accepted solution]

Hello Mijondano,

it should be possible using an SVI and associating it to a single FE port.

something like:

int fas4

switchport

switchport access vlan 2

interface vlan 2

desc WAN interface

ip address dhcp

no shut

Hope to help

Giuseppe

[mijondano]

Thanks a lot. I'm not an expert in cisco technologies and I wasn't aware of  SVI "virtual router interfaces" in switches. From the specs, the switch present in this router is a "managed switch". But is it L3 or L2 ? Can't find this info anywhere. From what I've read from your answer it needs to be a L3 switch for the SVI to work as I intend (wan port).

Thanks again.

[Giuseppe Larosa]

Hello Mijondano,

the SVI is supported to be noted in some 800 series there is a limitation to only two Vlans/SVIs supported

I have used the SVIs on 877 routers.

Hope to help

Giuseppe

[Giuseppe Larosa]

Alessio,

there is a German version of DSL standards for ADSL over ISDN, this is because ISDN was given free there and it  has wide coverage.

All the issue is to to leave unused (by DSL) a greater range of the lower frequencies to accomodate for the greater spectrum of ISDN BRI in comparison to analog line

Hope to help

Giuseppe

[Alessio Andreoli]

Thanks Giuseppe,

i honestly did not know about this combination!!

Alessio