Manual:IP/Neighbor discovery
Applies to RouterOS: v5 +
Summary
MikroTik Neighbor Discovery protocol (MNDP) and LLDP allows to "find" other devices compatible with MNDP or CDP (Cisco Discovery Protocol) or LLDP in Layer2 broadcast domain.
Neigbours
Sub-menu: /ip neighbor
This sub-menu lists all discovered neighbours in Layer-2 broadcast domain. It shows to which interface neighbour is connected, shows its IP/MAC addresses and several MikroTik related parameters. List is read-only.
Starting from ROS v6.45 amount of neighbour entries are limited to (total RAM in megabytes)*16 per interface to avoid memory exhaustion.
As an example, you can see several RouterBoards and two Cisco routers:
[admin@MikroTik] /ip neighbor> print # INTERFACE ADDRESS MAC-ADDRESS IDENTITY VERSION BOARD 0 ether13 192.168.33.2 00:0C:42:00:38:9F MikroTik 5.99 RB1100AHx2 1 ether11 1.1.1.4 00:0C:42:40:94:25 test-host 5.8 RB1000 2 Local 10.0.11.203 00:02:B9:3E:AD:E0 c2611-r1 Cisco I... 3 Local 10.0.11.47 00:0C:42:84:25:BA 11.47-750 5.7 RB750 4 Local 10.0.11.254 00:0C:42:70:04:83 tsys-sw1 5.8 RB750G 5 Local 10.0.11.202 00:17:5A:90:66:08 c7200 Cisco I...
Properties
| Property | Description |
|---|---|
| address (IP) | Highest IP address configured on a discovered device |
| address6 (IPv6) | IPv6 address configured on a discovered device |
| age (time) | Time interval since last discovery packet |
| board (string) | RouterBoard model. Displayed only to devices with installed RouterOS |
| identity (string) | Configured system identity |
| interface (string) | Interface name to which discovered device is connected |
| interface-name (string) | Interface name on the neighbor device connected to the L2 broadcast domain. Applies to CDP. |
| ipv6 (yes | no) | Shows whether device has IPv6 enabled. |
| mac-address (MAC) | Mac address of remote device. Can be used to connect with mac-telnet. |
| platform (string) | Name of the platform. For example "MikroTik", "cisco" ... etc. |
| software-id (string) | RouterOS software ID on a remote device. Applies only to devices installed with RouterOS. |
| system-caps (string) | System capabilities reported by the Link-Layer Discovery Protocol (LLDP). |
| system-caps-enabled (string) | Enabled system capabilities reported by the Link-Layer Discovery Protocol (LLDP). |
| unpack (none|simple|uncompressed-headers|uncompressed-all) | Shows discovery packet compression type. |
| uptime (time) | Uptime of remote device. Shown only to devices installed with RouterOS. |
| version (string) | Version number of installed software on a remote device |
Discovery configuration
Sub-menu: /ip neighbor discovery-settings
In this menu is possible to change state of the interface whether it participates in neighbor discovery or not. If it does, it will send out basic information about system and process received discovery packets broadcasted in Layer-2 network. List of interfaces is automatically managed by RouterOS. Items in the list cannot be removed nor added. Default settings depend on interface type and current state.
Removing an interface from this menu configuration will disable both the discovery of neighbours on this interface, and also the possibility of discovering this device itself on that interface.
| Property | Description |
|---|---|
| discover-interface-list (string; Default: !dynamic) | Interface list on which members the discovery protocol will run on |
LLDP
RouterOS sends out:
Chassis subtype (MAC)
- Port subtype (interface name)
- TTL
- System name (system identity)
- Sys description ({platform} RouterOS {osvers} {boardName})
- All IP addresses configured on the port
RouterOS accepts and processes:
- identity (LLDP_TYPE_SYS_NAME)
- interfaceName (depending on the priority, if one is empty checks the next: LLDP_TYPE_CHASSIS_ID, LLDP_TYPE_PORT_ID, LLDP_TYPE_PORT_DESC)
- ip4 (first entry of IPv4 LLDP_TYPE_MANAGEMENT_ADDR)
- ip6 (first entry of IPv6 LLDP_TYPE_MANAGEMENT_ADDR)
- TTL (LLDP_TYPE_TTL)
- MAC (Source - 6-11 byte)
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