ZyXEL Communications OMC-2301, User Manual

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Chapter 6 Basic Setting
OMC-2301 User’s Guide
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The following table describes the labels in this screen.
Table 15 EPON Setup
LABEL DESCRIPTION
p2p Access Peer-to-peer (p2p) access allows ONUs on the same port to send packets to each
other directly (without having to route through the uplink ports).
Select the port(s) you want to allow peer-to-peer communication.
Clear the check box to disable this feature. In this case, all packets from the ONUs on
the same port are sent to the uplink interface. ONUs cannot communicate with each
other.
DBA Mode The OLT uses the Plato mode to assign bandwidth dynamically based on the priority
and delay tolerance settings.
You can configure bandwidth settings in the
EPON Profile screen.
Aging Time This is how long all dynamically learned MAC addresses remain in the MAC address
table before they age out (and must be relearned).
Enter a time from 10 to 86400 seconds.
Upstream/Downstream Priority Queue Assignment
IEEE 802.1p defines up to 8 separate traffic types by inserting a tag into a MAC-layer frame that
contains bits to define class of service. Frames without an explicit priority tag are given the default
priority of the ingress port. Use the following fields to configure the priority level-to-physical queue
mapping.
On the O
NUs , traffic assigned to higher index queues gets serviced faster while traffic in lower index
queues may be dropped if the network is congested.
Priority Level (The following descriptions are based on the traffic types defined in the IEEE 802.1d
standard (which incorporates IEEE 802.1p).
Priority 7 Typically used for network control traffic such as router configuration messages.
Priority 6 Typically used for voice traffic that is especially sensitive to jitter (jitter is the variations
in delay).
Priority 5 Typically used for video that consumes high bandwidth and is sensitive to jitter.
Priority 4 Typically used for controlled load, latency-sensitive traffic such as SNA (Systems
Network Architecture) transactions.
Priority 3 Typically used for “excellent effort” or better than best effort and would include
important business traffic that can tolerate some delay.
Priority 2 This is for “spare bandwidth”.
Priority 1 This is typically used for non-critical “background” traffic such as bulk transfers that
are allowed but that should not affect other applications and users.
Priority 0 Typically used for best-effort traffic.
IGMP
Snooping
Select this option to enable IGMP snooping. This allows the OLT to passively learn
multicast group.
IGMP Proxy Select this option to enable IGMP proxy.
This allows the OLT to act as an IGMP proxy device to reduce multicast traffic. The
OLT issues IGMP host messages to a multicast router or server on behalf of the
connected multicast hosts.
IGMP Last
Member
Select this option to set the ONU to query all group members when a group leave
message is received. This is to confirm that all group members wish to leave that
IGMP group.
Clear this option to disable this feature. When a group leave message is received, all
group members are removed from an IGMP group without confirmation checks.
Upstream
Multicast
forwarding
Select Pass to forward upstream packets with a matching multicast MAC address in
the range shown.
Select
Discard to drop upstream packets with a matching multicast MAC address in
the range shown.