Motorola 110502USM001 - Vanguard 60 Router User Manual page 50

Using Bridging Routers to Connect LANs and Networks
Source Routing
Bridging
Environment
How Addressing
Schemes Affect
MAC Bridging and
IP Routing
Data delivery
Address style
Address attachment
Data delivery after
machine relocation
Address table size
Forwarding decisions
2-34
In a Source Routing Bridging environment, the bridge accesses the address and path
to reach the destination address from response to the router discovery frame.
If the sender forwards the packet to a host, depending on the type of Transport layer
service the host uses, the host transmits an acknowledgment to the sender.
The following table describes the differences between IP routing and MAC bridging
according to the addressing scheme used:
MAC Bridging
Addressing
Delivers data based on
MAC addresses.
Flat addressing: each
address identifies a
machine.
MAC addresses can be
permanently assigned to
hardware units.
MAC bridging allows
delivery to the same
MAC address when
hardware is relocated.
MAC bridging over large
networks involves very
large address tables.
Based on exact matches
of full 48-bit MAC
address.
IP Routing
Addressing
Delivers data based on IP
addresses.
Hierarchical addressing:
each address identifies a
network and a machine
on the network.
IP addresses cannot be
permanently assigned to
the hardware.
IP address must be
updated after the
machine is relocated.
IP routing over large
networks requires
smaller address tables.
Based on exact or partial
matches of the network
portion of the 32-bit IP
address.
IP Subnet
Addressing
Delivers data based on
subnet IP addresses:
network address,
subnetwork address, host
address.
Multiple directly
connected physical
networks can share a
single network address.
IP subnet addresses
cannot be permanently
assigned to the hardware.
IP address must be
updated after the
machine is relocated.
Same as IP routing
addressing.
Based on which port to
use to deliver the packet
to the subnet address.
Vanguard Routing Model