In MikroTik's RouterOS, the routing table is a key component that determines how packets are routed through the network.
Each entry in the routing table can have several associated flags that indicate the state or characteristics of that specific route.
Here we explain the meaning of the most common labels you could find:
disabled (X) | The Routing Rule is disabled. It has no effect on other routes and is not used in any way for forwarding or routing protocols. |
active (A) | Route is used for packet forwarding. Denotes an active route |
dynamic (D) | Routing rule created by the software and not by the administration interface. It is not exported, and cannot be modified directly. |
connect (C) | Connected route. Generated when an IP address is configured on an active interface |
static (S) | Static route. Route created by the user in a fixed way. This method will force packets to be sent through a gateway defined by the user/administrator |
rip (r) | RIP route |
bgp (b) | BGP route |
ospf (o) | OSPF route |
mme (m) | MME Route |
blackhole (B) | Silently discard the packet sent via this route |
unreachable (U) | Discard packets forwarded on this route. The originator of the packet is notified by means of an ICMP host unreachable message (type 3, code 1) |
prohibit (P) | Discard packets forwarded on this route. The originator of the packet is notified by means of an ICMP communication administratively prohibited message (type 3, code 13) |
These tags give you quick information about how a route has been learned, whether it is active and usable, and any special features it may have.
It is important to note that some labels can be combined to provide a more complete description of the state of a route.
For example, a route could be both Active (A) and Dynamic (D) and learned via OSPF (o), which tells you that it is an active route, dynamically learned via OSPF.
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