Руководство Пользователя для Cisco Cisco Aironet 340 Ethernet Bridges
4 - 8 Aironet 340 Series Bridge
your primary method, or standard, and choose that as the default setting
with the Encap option. All methods other than the primary, or default,
method need to be entered in the Encapsulation Table.
with the Encap option. All methods other than the primary, or default,
method need to be entered in the Encapsulation Table.
For all Aironet equipment, the defined packet encapsulation standard is
802.1H. The Show, Add and Remove options allow you to manage a
table of alternate, non-I802.1H encapsulation methods that might be
required to read data packets sent from the other, non-Aironet equip-
ment. The primary alternate to the I802.1H standard is RFC 1042.
802.1H. The Show, Add and Remove options allow you to manage a
table of alternate, non-I802.1H encapsulation methods that might be
required to read data packets sent from the other, non-Aironet equip-
ment. The primary alternate to the I802.1H standard is RFC 1042.
On an Ethernet LAN, the data portion of a frame may be in one of two
formats: DIX or DSAP/SSAP. The two formats differ both in packet size
specifications and in the manner of heading, or starting, the data por-
tion. An 802 wireless LAN requires packets to start with the DSAP/
SSAP format and therefore must provide a method of conversion. DSAP/
SSAP packet types are easily converted since the header is already in the
required style. DIX packet types present more of a problem since there
are many different formats and no standard conversion method.
formats: DIX or DSAP/SSAP. The two formats differ both in packet size
specifications and in the manner of heading, or starting, the data por-
tion. An 802 wireless LAN requires packets to start with the DSAP/
SSAP format and therefore must provide a method of conversion. DSAP/
SSAP packet types are easily converted since the header is already in the
required style. DIX packet types present more of a problem since there
are many different formats and no standard conversion method.
Aironet’s 802.1H conversion protocol accommodates both DIX and
DSAP/SSAP packet types. In an 802.1H conversion, DIX type packets
are prepended with a header that mimics the DSAP/SSAP header. In an
Aironet infrastructure, this header style is not used by any wired Ether-
net nodes so the remote radio node is always able to accurately recon-
vert the packet.
DSAP/SSAP packet types. In an 802.1H conversion, DIX type packets
are prepended with a header that mimics the DSAP/SSAP header. In an
Aironet infrastructure, this header style is not used by any wired Ether-
net nodes so the remote radio node is always able to accurately recon-
vert the packet.