FA4800 User Manual Release 1.9.40 13-1
Chapter 13
The Ceragon Ethernet
Ring
Scope
The description of Ceragon Ethernet Ring in this Chapter is completely generic: Both FA4800
and FibeAir 2000 links may participate in an Ethernet ring.
What is an Ethernet Ring
An Ethernet ring consists of several nodes connected by hops (links). Loops are not allowed
with Ethernet; therefore one hop is a Ring Protection Link (RPL) which “blocks” Ethernet
traffic. In the event of failure in the ring, the Ring Protection Link unblocks and Ethernet traf-
fic in the ring is restored.
Some terminology:
• Normal State – all member links are functional except the RPL which is blocked.
• Blocked - the air-link is up but Ethernet traffic is not transmitted across the link. The
Ethernet service panel for the RPL in the FibeAir2000 Manager is labeled Idle
• Unblocked - Ethernet traffic is transmitted across the RPL. The Ethernet service
panel for the RPL in the FibeAir2000 Manager is labeled Active
• Protection State – a member link is broken and the RPL passes Ethernet traffic
• Ring Protection Link - as described above
• Ring Link - any member link controlled by the RPL
• Independent Link - not subject to ring protection
Caution
VLAN IDs are used by Ceragon products in three separate contexts:
Management VLAN, Traffic VLAN and Ethernet Ring. It is recommended that
you use different VLAN IDs for each context.
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