How could I know which veth pairs are running in the current linux host

Hi, I have a question related to the veth pair that is used in Quantum. I know that Quantum used veth pair. Thus, I want to know which veth pair is running in the current host, which I mean querying the pair by using the linux command. I know that to construct veth pair, you can simply by using "ip link add name1 type veth name2". But I haven't found an command to query the current running veth pair. If you know how to realize the query function, could you please tell me? This would help me a lot. Thanks, :).