I have two PPPoE connections; why are the session IDs the same?

[weibin]

Router-C1111#show pppoe session all 
Total PPPoE sessions 2


session id: 1
local MAC address: xxxx.xxxx.xxxx,, remote MAC address: xxxx.xxxx.xxxx,
virtual access interface: Vi3, outgoing interface: Gi0/0/0
 VLAN Priority: 0
    77578 packets sent, 84671 received
    16997900 bytes sent, 84662990 received

session id: 1
local MAC address: xxxx.xxxx.xxxx, remote MAC address: xxxx.xxxx.xxxx,
virtual access interface: Vi2, outgoing interface: Gi0/0/1
 VLAN Priority: 0
    19316 packets sent, 42938 received
    3695339 bytes sent, 10995122 received

interface GigabitEthernet0/0/0
 no ip address
 negotiation auto
 pppoe enable group global
 pppoe-client dial-pool-number 1
!         
interface GigabitEthernet0/0/1
 no ip address
 negotiation auto
 pppoe enable group global
 pppoe-client dial-pool-number 2

interface Dialer1
 mtu 1492 
 ip address negotiated
 ip nat outside
 encapsulation ppp
 ip tcp adjust-mss 1452
 dialer pool 1
 dialer down-with-vInterface
 ipv6 dhcp client request vendor
 ipv6 dhcp client pd isp
 ipv6 address autoconfig default
 ipv6 enable
 ipv6 mtu 1280
 ipv6 tcp adjust-mss 1212
 ppp chap hostname xxxxxx
 ppp chap password 0 xxxxxx
 ppp pap sent-username xxxxxx password 0 xxxxxx
!         
interface Dialer2
 mtu 1492 
 ip address negotiated
 ip nat outside
 encapsulation ppp
 ip tcp adjust-mss 1452
 dialer pool 2
 dialer down-with-vInterface
 ppp chap hostname xxxxxx
 ppp chap password 0 xxxxxx
 ppp pap sent-username xxxxxx password 0 xxxxxx

[MHM Cisco World]

Session ID per interface

AS I see there is two Interfaces and each one have it session ID 1

MHM

[weibin]

Originally, I used OpenWRT with two PPPoE connections, each providing 50Mbps upstream per device，WAN1 for clients and WAN2 for the OpenVPN tunnel. However, now WAN2's upstream is occupying WAN1's bandwidth, and I don't know what's wrong.

[weibin]

When I use OpenWRT to dial up on WAN1 and then plug it back into the Cisco router, there is no problem; each connection has its own 50Mbps upstream.