Cisco Cisco Aironet 350 Wireless Bridge 기술 매뉴얼
When the number of ports in a network exceeds the port capacity of the switch, you must cross−connect
multiple switch chassis, which defines a trunk. The trunk is not a member of any VLAN, but a conduit over
which traffic passes for one or more VLANs.
multiple switch chassis, which defines a trunk. The trunk is not a member of any VLAN, but a conduit over
which traffic passes for one or more VLANs.
In fundamental terms, the key in the configuration of an access point to connect to a specific VLAN is to
configure its SSID to recognize that VLAN. Because VLANs are identified by a VLAN ID or name, it follows
that, if the SSID on an access point is configured to recognize a specific VLAN ID or name, a connection to
the VLAN is established. When this connection is made, associated wireless client devices that have the same
SSID can access the VLAN through the access point. The VLAN processes data to and from the clients the
same way that it processes data to and from wired connections. You can configure up to 16 SSIDs on your
access point, so you can support up to 16 VLANs. You can assign only one SSID to a VLAN.
configure its SSID to recognize that VLAN. Because VLANs are identified by a VLAN ID or name, it follows
that, if the SSID on an access point is configured to recognize a specific VLAN ID or name, a connection to
the VLAN is established. When this connection is made, associated wireless client devices that have the same
SSID can access the VLAN through the access point. The VLAN processes data to and from the clients the
same way that it processes data to and from wired connections. You can configure up to 16 SSIDs on your
access point, so you can support up to 16 VLANs. You can assign only one SSID to a VLAN.
You extend VLANs into a wireless LAN when you add IEEE 802.11Q tag awareness to the access point.
Frames destined for different VLANs are transmitted by the access point wirelessly on different SSIDs with
different WEP keys. Only the clients associated with that VLAN receive those packets. Conversely, packets
that come from a client associated with a certain VLAN are 802.11Q tagged before they are forwarded onto
the wired network.
Frames destined for different VLANs are transmitted by the access point wirelessly on different SSIDs with
different WEP keys. Only the clients associated with that VLAN receive those packets. Conversely, packets
that come from a client associated with a certain VLAN are 802.11Q tagged before they are forwarded onto
the wired network.
For example, employees and guests can access the wireless network of a company at the same time and be
administratively separate. A VLAN maps to an SSID, and the wireless client attaches to the appropriate SSID.
In networks with wireless bridges, you can pass multiple VLANs across the wireless link in order to provide
connectivity to a VLAN from separate locations.
administratively separate. A VLAN maps to an SSID, and the wireless client attaches to the appropriate SSID.
In networks with wireless bridges, you can pass multiple VLANs across the wireless link in order to provide
connectivity to a VLAN from separate locations.
If 802.1q is configured on the FastEthernet interface of an access point, the access point always sends
keepalives on VLAN1 even if VLAN 1 is not defined on the access point. As a result, the Ethernet switch
connects to the access point and generates a warning message. There is no loss of function on either the access
point or the switch, but the switch log contains meaningless messages that can cause more important messages
to be wrapped and not seen.
keepalives on VLAN1 even if VLAN 1 is not defined on the access point. As a result, the Ethernet switch
connects to the access point and generates a warning message. There is no loss of function on either the access
point or the switch, but the switch log contains meaningless messages that can cause more important messages
to be wrapped and not seen.
This behavior creates a problem when all SSIDs on an access point are associated to mobility networks. If all
SSIDs are associated to mobility networks, the Ethernet switch port to which the access point is connected can
be configured as an access port. The access port is normally assigned to the native VLAN of the access point,
which is not necessarily VLAN1. This causes the Ethernet switch to generate warning messages noting that
traffic with an 802.1q tag is sent from the access point.
SSIDs are associated to mobility networks, the Ethernet switch port to which the access point is connected can
be configured as an access port. The access port is normally assigned to the native VLAN of the access point,
which is not necessarily VLAN1. This causes the Ethernet switch to generate warning messages noting that
traffic with an 802.1q tag is sent from the access point.
You can eliminate the excessive messages on the switch if you disable the keepalive function.
If you ignore minor points in these concepts when you deploy VLANs with Cisco Aironet wireless
equipment, you can experience unexpected performance, for example:
equipment, you can experience unexpected performance, for example: