How to set up a VPN IPSec server with VPN backup via CISCO?

Question

linux

There is a CISCO ASA 55XX router.
All 4 ports are busy:
1. Port - Internet
2. Port - Internet (another provider)
3. Port - VPN (IPSec site to site) (Dedicated channel)
4. Port - Local (10.0.0.0/24)
There is also an IPSEC server (Debian+Openswan). Another subnet (192.168.0.0/24) should work in the local infrastructure connecting to the remote office via a linux ipsec server with a backup link via VPN IPSEC over Internet on the cisco router. Please tell me how to organize it. I can draw a diagram if needed.
The second question relates to my ideas on how to organize this: Is it possible to assign two IPs to one port in cisco asa 55XX routers?

Answer 1

A diagram would be helpful. In general, there is such a thing as dynamic routing protocols.

Answer 2

Is it possible to assign two IPs to one port in cisco asa 55XX routers?
config example with vlan
interface GigabitEthernet0/1.4
description For Wi-Fi
vlan 4
nameif wifimot
security-level 5
ip address 192.168.200.1 255.255.255.0 standby 192.168.200.2