ISN


Hank Nussbacher (HANK%TAUNIVM.BITNET@CUNYVM.CUNY.EDU)
Wed, 16 Mar 88 17:15:43 IST


>If bridges are connected via a closed polygon, the packet stays
>"in flight" forever.
>
>charlie slater
>charlie@amdcad.amd.com

There is a bridge that is about 70% of a router. It is called
REB (Remote Ethernet Bridge). The designer has taken a small
number of the fields in the IP header and has done a similar
implementation at level II.

For example, REB can close loops. I can assign a weight to each
line (i.e. one line is 9.6kb, another is T1, another is X.25,
and another should hardly ever be used) and based on the weight
and the network load, the REB will determine the routing the
packet should take. In addition, it has implemented a TTL type
of field so that packets that loop around between REBs get
removed. You can configure in each REB what the maximum TTL
should be and each outgoing packet gets assigned that number.
As the packet passes thru other REBs, the number is decremented.
When it hits zero, the packet is thrown away.

There are many other functions that was designed via 802.3 D -
Managament specs.

What it cannot do is ARP or ICMP but if you are looking for a
bridge replacement, you should seriously evaluate the RAD REB.

Hank



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