HP 200 Series Services And Applications page 247
Hide thumbs
Also See for 200 Series:
- Installation manual (144 pages) ,
- Hardware support document (95 pages) ,
- Instructions manual (7 pages)
Table of Contents
Advertisement
Encapsulation Bridging
There are many protocols that are non-routable and therefore must be
bridged. These non-routable protocols must be encapsulated in an FDDI
frame in order to be transported across the ring. Encapsulation is the
bridge's implementation that enables interconnection of similar networks
over an FDDI network. Figure 7 shows how non-routable protocols might be
encapsulated across an FDDI network. Within such a topology, a bridge
encapsulates the original Ethernet/IEEE 802.3 frame into a new message
type (in this case, an FDDI-specific packet) for travel across the FDDI ring.
At the destination, the message is removed from the FDDI packet and
transmitted in its original form.
LAN 1
LAN 1 Frame
FDDI
Encapsulated
DA
Frame
LAN 2 Frame
Figure 7. Encapsulation Bridging
It is important to note that encapsulation is not the preferred method of
transporting data across an FDDI network. In addition, no standard method
of encapsulation exists, preventing multivendor interoperability.
Internetworking with HP Routers
FDDI Ring
type
data
DA SA
Ethernet
SA
LLC
type
data
DA SA
Shining a Light on FDDI
LAN 2
FCS
data
FCS
FCS
3-53
Advertisement
Table of Contents
