We use Cisco 891 routers as CPE for several client sites. They are all running IOS 15.
Cisco IOS Software, C890 Software (C890-UNIVERSALK9-M), Version 15.0(1)M8, RELEASE SOFTWARE (fc1)
The majority of these sites terminate against an external ADSL2 modem which we put into bridge mode (I can't recall the exact bridge mode, but basically the modem just passes everything through).
We rely on our Cisco 891 devices for PPP session termination, NAT, etc... And I've come up with the below config, we've been successfully for some time with our main ISP, its been working fine:
interface GigabitEthernet0 description WAN PPPoE ADSL2+ bandwidth 1024 bandwidth receive 20480 no ip address ip nat outside ip virtual-reassembly duplex auto speed auto pppoe-client dial-pool-number 1 interface Dialer0 description ADSL2+ Dialer Interface bandwidth 1024 bandwidth receive 20480 ip address negotiated no ip redirects no ip proxy-arp ip mtu 1492 ip nat outside ip virtual-reassembly encapsulation ppp ip tcp adjust-mss 1452 dialer pool 1 dialer-group 1 ppp authentication chap pap callin ppp chap hostname XXX@isp.com ppp chap password 0 XXX ppp pap sent-username XXX@isp.com password 0 XXX no cdp enable
However, in the last few days our ISP has made some changes which has affected a few customer sites, and they've said we need to ensure that all CPE are using "PPPoA and VC Mux encapsulation"
I've been looking at some existing Cisco CPE and cannot figure out a way to ensure we are using PPPoA, or a way to force that if not. It looks like, right now, that we're using PPPoE:
PPPoE vaccess, cloned from Dialer0
All config examples I've found are using ATM interface which allows specification of PVC, encapsulation settings etc...
I can understand that things like PVC settings are modem-related and so would not be in the router config as our routers do not contain the modem functionality. But, can I assume that once the traffic has passed the modem to the WAN interface on the router, the ATM cells have been converted to Ethernet packets, and is this why there is no way (that I can see) to configure PPPoA instead of PPPoE?