Zyxel VES-1624FT-55A Инструкция по эксплуатации онлайн [39/312] 154555

Zyxel VES-1624FT-55A Инструкция по эксплуатации онлайн [39/312] 154555
Chapter 1 Introducing the IP DSLAM
VES-1624FT-55A User’s Guide
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DHCP Relay Option 82
The system supports DHCP relay agent82 (RFC 3046) that adds additional information to
client DHCP requests that the IP DSLAM relays to a DHCP server. It also supports adding the
sub-option 2 (Remote ID) with additional information.
DHCP Snooping
DHCP snooping allows the system to identify packets with DHCP server assigned IP
address(es) and block access of devices using unknown IP addresses on a subscriber port. You
can also manually add static IP addresses to the DHCP snooping table.
2684 Routed Mode
The IP DSLAM can handle 2684 routed mode traffic.
PPPoA-to-PPPoE (PAE) PVC
This feature allows the system to translate PPPoA packets to PPPoE packets (and vice versa)
to allow communication between CPE clients and an access concentrator (such as a BRAS)
through the IP DSLAM.
DSCP-to-IEEE 802.1p Priority Mapping
DiffServ is a class of service (CoS) model that marks packets with DiffServ Code Points
(DSCP) so that they receive specific per-hop treatment at DiffServ-compliant network devices
along the route. You can configure DSCP-to-IEEE 802.1p mappings to allow the IP DSLAM
to prioritize all incoming traffic based on the DSCP value according to the mapping table.
Transparent LAN Service (TLS)
Use TLS (also known as VLAN stacking) to add an outer VLAN tag to the inner IEEE 802.1Q
tagged frames that enter the network. By tagging the tagged frames (“double-tagged” frames),
the service provider can manage up to 4,094 VLAN groups with each group containing up to
4,094 customer VLANs. This allows a service provider to provide different services based on
specific VLANs, for many different customers.
Downstream Broadcast
The IP DSLAM can block downstream broadcast packets from being sent to specified VLANs
on specified ports.
Upstream Broadcast Rate Limiting
Rate Limiting on the subscriber ports allows service providers to offer tiered service in
increments of 32 Kbps. This service differentiation is not only to fulfill the needs of different
customers, but also to provide a network infrastructure that combines guaranteed performance
and flexibility in service provisioning.
System Error Logging
The IP DSLAM’s system error log will record error logs locally. These logs may be viewed
again after a warm restart.

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