Show interfaces, don't display pppoeX interfaces.
VyOS config:
```
set interfaces ethernet eth0 description 'WAN01-pppoe'
set interfaces pppoe pppoe0 authentication password 'bar'
set interfaces pppoe pppoe0 authentication user 'foo'
set interfaces pppoe pppoe0 source-interface 'eth0'
```
Show interfaces
```
vyos@vyos:~$ show interfaces
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface IP Address S/L Description
--------- ---------- --- -----------
eth0 - u/u WAN01-pppoe
eth1 10.0.0.1/24 u/u LAN
eth2 192.0.2.12/24 u/u WAN02-dhcp
eth3 - u/u
lo 127.0.0.1/8 u/u
::1/128
vyos@vyos:~$
vyos@vyos:~$ show interfaces pppoe
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface IP Address S/L Description
--------- ---------- --- -----------
vyos@vyos:~$
vyos@vyos:~$ show interfaces pppoe pppoe0
pppoe0: Coming up
vyos@vyos:~$
```
PPPoE session is established
```
vyos@vyos:~$ sudo ip -c link show dev pppoe0
6: pppoe0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1492 qdisc pfifo_fast state UNKNOWN mode DEFAULT group default qlen 3
link/ppp
vyos@vyos:~$
vyos@vyos:~$ sudo ip a show dev pppoe0
6: pppoe0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1492 qdisc pfifo_fast state UNKNOWN group default qlen 3
link/ppp
inet 10.1.1.100 peer 10.1.1.1/32 scope global pppoe0
valid_lft forever preferred_lft forever
vyos@vyos:~$
```