Learning VPP: OSPF routing protocol
Overview
The task at hand is to enable OSPF on VPP router. For this purpose is chosen FRRouting (FRR), which is an IP routing protocol suite for Linux and Unix platforms.
I will use VPP’s router plugin, that implements logic to punt control packets to the Linux network stack and a Netlink-based mechanism that synchronizes the Linux’s routing table into VPP’s FIB.
In order to compile the router plugin with VPP version 20, I had to make few modifications to source code that can be seen on Github.
Topology
I have used 4 VirtualBox VMs for two VPP routers and two hosts.
VPP VM configuration looks as follows.
Host VM configuration looks as follows.
Install VPP from the package
For your convenience, I have uploaded prebuilt Debian packages targeted against Ubuntu 18.04. The VPP will be installed and started as a service with a router plugin enabled.
curl -s https://packagecloud.io/install/repositories/emflex/fdio/script.deb.sh | sudo bash sudo apt-get install vpp vpp-plugin-core vpp-plugin-dpdk vpp-ext-deps
Install VPP from source
Here, I have introduced a script to download and build VPP from sources together with the router plugin.
git clone https://github.com/garyachy/frr-vpp.git cd frr-vpp sudo ./build_vpp.sh sudo dpkg -i vpp/build-root/*.deb
Install FRR from the package
curl -s https://deb.frrouting.org/frr/keys.asc | sudo apt-key add - FRRVER="frr-stable" echo deb https://deb.frrouting.org/frr $(lsb_release -s -c) $FRRVER | sudo tee -a /etc/apt/sources.list.d/frr.list sudo apt update && sudo apt install frr frr-pythontools
Configure FRR
Make the following changes to /etc/frr/daemons
ospfd=yes ospfd_options=" -A 127.0.0.1 -f /etc/frr/ospfd.conf"
Make the following changes to /etc/frr/ospfd.conf
hostname ospfd
password zebra
log file /var/log/frr/ospfd.log informational
log stdout
!
router ospf
ospf router-id 10.10.10.1
network 10.10.10.1/24 area 0.0.0.0
network 100.100.100.0/24 area 0.0.0.0
!
Configure Netplan
VPP interface need to be added into /etc/netplan/50-cloud-init.yaml and netplan apply executed.
network:
ethernets:
enp0s3:
dhcp4: true
vpp0:
addresses:
- 10.10.10.1/24
vpp1:
addresses:
- 100.100.100.1/24
version: 2
Results
VPP creates TAP interfaces in Linux.
denys@vpp1:~$ ip addr
5: vpp0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 1000
link/ether 08:00:27:4a:5c:a2 brd ff:ff:ff:ff:ff:ff
inet 10.10.10.1/24 brd 10.10.10.255 scope global vpp0
valid_lft forever preferred_lft forever
inet6 fe80::a00:27ff:fe4a:5ca2/64 scope link
valid_lft forever preferred_lft forever
6: vpp1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 1000
link/ether 08:00:27:7a:4b:93 brd ff:ff:ff:ff:ff:ff
inet 100.100.100.1/24 brd 100.100.100.255 scope global vpp1
valid_lft forever preferred_lft forever
inet6 fe80::a00:27ff:fe7a:4b93/64 scope link
valid_lft forever preferred_lft forever
You can see that OSPF routes were installed into Linux.
denys@vpp1:~$ ip route default via 192.168.0.1 dev enp0s3 proto dhcp src 192.168.0.108 metric 100 10.10.10.0/24 dev vpp0 proto kernel scope link src 10.10.10.1 20.20.20.0/24 via 100.100.100.2 dev vpp1 proto ospf metric 20 100.100.100.0/24 dev vpp1 proto kernel scope link src 100.100.100.1 172.17.0.0/16 dev docker0 proto kernel scope link src 172.17.0.1 linkdown 192.168.0.0/24 dev enp0s3 proto kernel scope link src 192.168.0.108 192.168.0.1 dev enp0s3 proto dhcp scope link src 192.168.0.108 metric 100
Also, hosts can ping each other.
denys@host2:~$ ping 10.10.10.2 PING 10.10.10.2 (10.10.10.2) 56(84) bytes of data. 64 bytes from 10.10.10.2: icmp_seq=2 ttl=62 time=0.769 ms 64 bytes from 10.10.10.2: icmp_seq=3 ttl=62 time=0.547 ms 64 bytes from 10.10.10.2: icmp_seq=4 ttl=62 time=0.593 ms