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102 AT-WR4500 Series - IEEE 802.11abgh Outdoor Wireless Routers
RouterOS v3 Configuration and User Guide
5.3.5 Interfaces
Submenu level: /routing ospf interface
Description
This facility provides tools for additional in-depth configuration of OSPF interface specific parameters.
You do not have to configure interfaces in order to run OSPF
Property Description
authentication-key (text; default: "") - authentication key have to be used by neighboring routers that
are using OSPF's simple password authentication
cost (integer: 1..65535; default: 1) - interface cost expressed as link state metric
dead-interval (time; default: 40s) - specifies the interval after which a neighbor is declared as dead. The
interval is advertised in the router's hello packets. This value must be the same for all routers and access
servers on a specific network
hello-interval (time; default: 10s) - the interval between hello packets that the router sends on the
interface. The smaller the hello-interval, the faster topological changes will be detected, but more routing
traffic will ensue. This value must be the same on each end of the adjacency otherwise the adjacency will
not form
interface (name; default: all) - interface on which OSPF will run
all - is used for the interfaces not having any specific settings
priority (integer: 0..255; default: 1) - router's priority. It helps to determine the designated router for the
network. When two routers attached to a network both attempt to become the designated router, the
one with the higher router's priority takes precedence
retransmit-interval (time; default: 5s) - time between retransmitting lost link state advertisements.
When a router sends a link state advertisement (LSA) to its neighbor, it keeps the LSA until it receives
back the acknowledgment. If it receives no acknowledgment in time, it will retransmit the LSA. The
following settings are recommended: for Broadcast network are 5 seconds and for Point-to-Point
network are 10 seconds
transmit-delay (time; default: 1s) - link state transmit delay is the estimated time it takes to transmit a
link state update packet on the interface
Example
To add an entry that specifies that ether2 interface should send Hello packets every 5 seconds, do the
following:
[admin@AT-WR4562] routing ospf> interface add interface=ether2 hello-interval=5s
[admin@AT-WR4562] routing ospf> interface print
0 interface=ether2 cost=1 priority=1 authentication-key=""
retransmit-interval=5s transmit-delay=1s hello-interval=5s
dead-interval=40s
[admin@AT-WR4562] routing ospf>
5.3.6 Virtual Links
Submenu level: /routing ospf virtual-link
Description
As stated in OSPF RFC, the backbone area must be contiguous. However, it is possible to define areas in
such a way that the backbone is no longer contiguous. In this case the system administrator must restore
backbone connectivity by configuring virtual links. Virtual link can be configured between two routers
through common area called transit area, one of them should have to be connected with backbone.
Virtual links belong to the backbone. The protocol treats two routers joined by a virtual link as if they
were connected by an unnumbered point-to-point network