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This matches the routing realm. Routing realms are used in complex routing
setups involving dynamic routing protocols like BGP.
[\fB!\fP] \fB\-\-realm\fP \fIvalue\fP[\fB/\fP\fImask\fP]
Matches a given realm number (and optionally mask). If not a number, value
can be a named realm from /etc/iproute2/rt_realms (mask can not be used in
Both value and mask are four byte unsigned integers and may be specified in
decimal, hex (by prefixing with "0x") or octal (if a leading zero is given).