Specifications

Installation and Operation Manual Chapter 1 Introduction
IPmux-24 Ver. 1.5 Functional Description 1-21
Packet Type VLAN Support
ARP initiated by IPmux-24 No VLAN value unless it is to one of the managers or the connection’s IP
address
Telnet
Ping initiated by IPmux-24
Bridge
The bridge operates in the VLAN-aware and VLAN-unaware modes. In the
VLAN-aware mode, the bridge supports up to 64 VLANs. Learning and filtering can
be enabled or disabled. Static MAC addresses are stored in the MAC table. The
size of the MAC table is 8128 addresses. The bridge can handle frames of up to
1632 bytes.
The unit can append additional VLAN tag (provider VLAN) at the user port ingress
and remove it at the network port ingress. The provider VLAN includes provider
VID and priority (VLAN stacking).
Double Host
IPmux-24 includes two different hosts:
• Management host for handling the management traffic
• PW host for handling the pseudowire traffic.
Each host has a separate MAC address.
Ring Topology
Ring topology, implemented by means of the RAD-proprietary protocol (RFER),
provides protection for the Ethernet transmission path, and is especially suited
for MAN and dark fiber applications.
When the ring is enabled, the data is propagated between the nodes either
”clockwise” or ”counterclockwise”. Because of the Ethernet protocol
characteristics, actually the ring cannot be closed: a pair of adjacent nodes on the
ring keep the ring open by disconnecting an arbitrary ring segment, thereby
preventing frames from making a full round trip.
Figure 1-16 shows a basic ring topology; the arrow shows the path followed by
frames exchanged between ring nodes A and D during normal operation,
assuming that the blocked segment is between nodes A and D.