一、BGP简介

二、安装FFRouting

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 # add GPG key
curl -s https://deb.frrouting.org/frr/keys.gpg | sudo tee /usr/share/keyrings/frrouting.gpg > /dev/null

# frr-stable will be the latest official stable release. frr-rc is the latest release candidate in beta testing
FRRVER="frr-stable"
echo deb '[signed-by=/usr/share/keyrings/frrouting.gpg]' https://deb.frrouting.org/frr \
     $(lsb_release -s -c) $FRRVER | sudo tee -a /etc/apt/sources.list.d/frr.list

# update and install FRR
sudo apt update && sudo apt install frr frr-pythontools

三、配置FFRouting进行BGP组网

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vim /etc/frr/frr.conf
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router bgp 64501
 bgp router-id 100.64.1.254
 bgp bestpath as-path multipath-relax
 neighbor 100.64.1.1 remote-as 64502
 neighbor 100.64.1.2 remote-as 64503
 neighbor 100.64.1.3 remote-as 64504
 neighbor 100.64.1.4 remote-as 64505
 
 address-family ipv4 unicast
  network 100.64.1.254/32
  neighbor 100.64.1.1 default-originate
  neighbor 100.64.1.1 route-map PERMIT_ALL in
  neighbor 100.64.1.1 route-map PERMIT_ALL out
  neighbor 100.64.1.2 default-originate
  neighbor 100.64.1.2 route-map PERMIT_ALL in
  neighbor 100.64.1.2 route-map PERMIT_ALL out
  neighbor 100.64.1.3 default-originate
  neighbor 100.64.1.3 route-map PERMIT_ALL in
  neighbor 100.64.1.3 route-map PERMIT_ALL out
  neighbor 100.64.1.4 default-originate
  neighbor 100.64.1.4 route-map PERMIT_ALL in
  neighbor 100.64.1.4 route-map PERMIT_ALL out
  maximum-paths 4
 exit-address-family

ip prefix-list ALLOW_ALL seq 5 permit 0.0.0.0/0 le 32

route-map PERMIT_ALL permit 10
 match ip address prefix-list ALLOW_ALL

四、验证BGP组网