Avaya Configuring Bridging Services Bedienungsanleitung Seite 34

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Configuring Bridging Services
1-8 114060 Rev. A
Figure 1-7. AppleTalk ARP (Originating on FDDI) to 802.3 Translation
Spanning Tree Algorithm
The spanning tree algorithm ensures the existence of a loop-free topology in
networks that contain parallel bridges. (Refer to Source Routing Appendix to IEEE
Standard 802.1d Media Access Control (MAC) Bridges for details on the spanning
tree algorithm.) A loop occurs when there are alternate routes between hosts. If
there is a loop in an extended network, bridges may forward traffic indefinitely,
which can result in increased traffic and degradation in network performance.
Figure
1-8 shows an example of a network containing a loop: two parallel bridges,
Bridge 1 and Bridge 2, connect LANs A and B.
DA SA
TYPE
DATA FCS
SNAP LLC OUI
AA AA 03 = 00 00 00
AppleTalk ARP frame originating on FDDI LAN
Through Bridge B to 802.3 LAN
=80F3
Bridge B
• Extracts addressing information from the FDDI MAC header
• Incorporates address information into newly generated 802.3 header
• Adds a length field
• Encapsulates FDDI data according to RFC 1042
• Recalculates FCS
DA SA
TYPE
DATA
FCS
SNAP LLC OUI
AA AA 03 = 00 00 00
=80F3
LEN
BRG0005A
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