add interconnect notes

Interconnects Notes.md

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+# Interconnects Notes.md
+The Interconnect servers allow for traffic between the AWS Transit Gateways. They are located in test and prod AWS mdr-x-c2-gov account. The interconnects are redundent. 
+
+2 servers for test and 2 servers for prod. 4 total servers. 
+
+Redundent VPNs are used to connect from the transit gateway to the interconnect servers. 
+Each interconnect server has 4 VPN connections, two per transit gateway. 
+
+---
+# Software
+08/10/2020
+
+## Strongswan
+
+strongswan is the VPN IPSEC tunnels software used to connect to the aws VPN tunnel. Salt is being used to configure the software. It used the vpn_info pillar. 
+
+## Quagga
+
+Quagga contains zebra and behaves like a cisco router. It is where the BGP is configured.  
+
+The command to use to configure the software
+
+`vtysh`
+
+2 services for quagga
+```
+systemctl status bgpd
+systemctl status zebra
+```
+
+## Troubleshooting Steps
+
+1. check interfaces `ifconfig`, no interfaces, restart strongswan. 
+2. ensure you can ping the internal 169.* address. Minus 1 from the IP address to ping AWS VPN IP address
+