Allied Telesis AT-WR4500 - Manual (Page 76)

76 AT-WR4500 Series - IEEE 802.11abgh Outdoor Wireless Routers
RouterOS v3 Configuration and User Guide
reply-only - the interface will only reply to the requests for to its own IP addresses, but neighbor MAC
addresses will be gathered from /ip arp statically set table only
interface (name) - physical interface to the network where the VLAN is put
mtu (integer; default: 1500) - Maximum Transmission Unit
name (name) - interface name for reference
vlan-id (integer; default: 1) - Virtual LAN identifier or tag that is used to distinguish VLANs. Must be
equal for all computers that belong to the same VLAN.
MTU should be set to 1500 bytes as on Ethernet interfaces. But this may not work with some Ethernet
interfaces that do not support receiving/transmitting of full size Ethernet packets with VLAN header
added (1500 bytes data + 4 bytes VLAN header + 14 bytes Ethernet header). In this situation MTU
1496 can be used, but note that this will cause packet fragmentation if larger packets have to be sent
over interface. At the same time remember that MTU 1496 may cause problems if path MTU discovery
is not working properly between source and destination.
Example
To add and enable a VLAN interface named test with vlan-id=1 on interface ether1:
[admin@AT-WR4562] interface vlan> add name=test vlan-id=1 interface=ether1
[admin@AT-WR4562] interface vlan> print
Flags: X - disabled, R - running
# NAME MTU ARP VLAN-ID INTERFACE
0 X test 1500 enabled 1 ether1
[admin@AT-WR4562] interface vlan> enable 0
[admin@AT-WR4562] interface vlan> print
Flags: X - disabled, R - running
# NAME MTU ARP VLAN-ID INTERFACE
0 R test 1500 enabled 1 ether1
[admin@AT-WR4562] interface vlan>
4.4.3
Application Example
VLAN example on AT-WR4500 Routers
Let us assume that we have two or more RouterOS routers connected with a hub. Interfaces to the
physical network, where VLAN is to be created is ether1 for all of them (it is needed only for example
simplification, it is NOT a must).
To connect computers through VLAN they must be connected physically and unique IP addresses should
be assigned them so that they could ping each other. Then on each of them the VLAN interface should be
created:
[admin@AT-WR4562] interface vlan> add name=test vlan-id=32 interface=ether1
[admin@AT-WR4562] interface vlan> print
Flags: X - disabled, R - running
# NAME MTU ARP VLAN-ID INTERFACE
0 R test 1500 enabled 32 ether1
[admin@AT-WR4562] interface vlan>
If the interfaces were successfully created, both of them will be running. If computers are connected
incorrectly (through network device that does not retransmit or forward VLAN packets), either both or
one of the interfaces will not be running.
When the interface is running, IP addresses can be assigned to the VLAN interfaces.