View source for Workshop/BGP-configs

This page is created to help with the [[Workshop/BGP|bgp workshop]] that is organized in the lab.
= Bird =
== basic configuration ==
Enable the direct protocol. This will make Bird to learn all of your directly attached routes.
 protocol direct {
        export all;
 }
In the kernel protocol, uncomment the following line:
 #     learn;   # Learn all alien routes from the kernel
== filter configuration ==
 filter in_filter {
        # do not accept routes for our directly connected network
        if ( net = 185.117.82.112/29 ) then reject;
        accept;
 }
 filter out_filter {
        # do not export anything that is not our directly connected network
        if ( net = 185.117.82.112/29 ) then accept;
        reject;
 }
== bgp template ==
 template bgp PEERS {
        debug { states, events };
        local as myas;
        startup hold time 0;
        import keep filtered;  # keep filtered routes in bird, so you can see it in: show route filtered
        import filter in_filter;
        export filter out_filter;
        gateway direct;
 }
== neighbor configuration ==
 protocol bgp bgp_up1 from lab {
        description "Upstream 1 (cassie) via eth0.111";
        neighbor 10.125.11.1 as 65535;
        source address 10.125.11.2;
 }
 protocol bgp bgp_up2 from lab {
        description "Upstream 2 (beta) via eth0.211";
        neighbor 10.126.11.1 as 59851;
        source address 10.126.11.2;
 }

== Commands cheat sheet ==
 show protocols                    - list all configured protocols
 show protocol bgp_up2             - get the status information for protocol bgp_up2
 show protocol all bgp_up2         - get full status information for protocol bgp_up2
 show route export bgp_up2         - list all exported networks to peer bgp_up2
 show route all export bgp_up2     - list all exported networks to peer bgp_up2 and their additional parameters
 show route for 185.117.82.104     - get the routes for 185.117.82.104
 show route all for 185.117.82.104 - get the routes for 185.117.82.104 and its path info
 show route filtered               - list all prefixes that are filtered 
 show route protocol bgp_up2       - list all prefixes that you receive from peer bgp_up2
 show memory                       - get the memory usage of Bird

= Quagga =
== basic configuration ==
 router bgp 65011
  bgp router-id 185.117.82.113
  bgp log-neighbor-changes
  bgp graceful-restart
  network 185.117.82.112/29

== neighbors configuration ==
 neighbor 10.125.11.1 remote-as 65535
 neighbor 10.125.11.1 description "Upstream 1 (cassie) via eth0.111"
 neighbor 10.125.11.1 update-source 10.125.11.2
 neighbor 10.125.11.1 soft-reconfiguration inbound
 neighbor 10.125.11.1 prefix-list in_filter in
 neighbor 10.125.11.1 prefix-list out_filter out

 neighbor 10.126.11.1 remote-as 59851
 neighbor 10.126.11.1 description "Upstream 2 (beta) via eth0.211"
 neighbor 10.126.11.1 update-source 10.125.11.2
 neighbor 10.126.11.1 soft-reconfiguration inbound
 neighbor 10.126.11.1 prefix-list in_filter in
 neighbor 10.126.11.1 prefix-list out_filter out

== prefix lists ==
allow all prefixes except the one I'm advertising
 ip prefix-list in_filter seq 1 deny 185.117.82.112/29
 ip prefix-list in_filter seq 10 permit any
Export only my directly connected prefix
 ip prefix-list out_filter seq 1 permit 185.117.82.112/29
 ip prefix-list out_filter seq 10 deny any

== Commands cheat sheet ==
 show ip bgp neighbors   - list all configured neighbors and full information about them
 show ip prefix-list     - list all prefix lists
 show memory             - get a memory usage info

= Client container = 

 sysctl net.ipv4.ip_forward=1
 ip netns add bgp
 ip link add veth0 type veth peer name veth1
 ip link set veth1 netns bgp
 ip netns exec bgp /bin/bash

= iproute2 commands =
* Add a VLAN 111 to eth0
 # ip link add link eth0 name eth0.111 type vlan id 111 
* Bring a device UP
 # ip link set up dev eth0
* Bring a device DOWN
 # ip link set down dev eth0
* Check the route to a destination
 # ip route get 8.8.8.8
* Create a new virtual ethernet pair. Useful for communication with containers.
 # ip link add veth0 type veth peer name veth1
* Create a new network namespace called '''bgp'''
 # ip netns add bgp
* Move device '''veth1''' into network namespace '''bgp'''
 # ip link set veth1 netns bgp
* Execute a command inside netns '''bgp'''. Its easiest if the command is a shell
 # ip netns exec bgp /bin/bash