1This matches the routing realm. Routing realms are used in complex routing 2setups involving dynamic routing protocols like BGP. 3.TP 4.BI "--realm " "[!] " "value[/mask]" 5Matches a given realm number (and optionally mask). If not a number, value 6can be a named realm from /etc/iproute2/rt_realms (mask can not be used in 7that case). 8