ECS4660-28F_Management Guide-R03

C HAPTER 1 | Introduction
Description of Software Features
– 99 –
This switch also supports several common methods of prioritizing layer 3/4
traffic to meet application requirements. Traffic can be prioritized based on
the priority bits in the IP frame’s Type of Service (ToS) octet using DSCP, or
IP Precedence or TCP/UDP port numbers. When these services are enabled,
the priorities are mapped to a Class of Service value by the switch, and the
traffic then sent to the corresponding output queue.
QUALITY OF SERVICE Differentiated Services (DiffServ) provides policy-based management
mechanisms used for prioritizing network resources to meet the
requirements of specific traffic types on a per-hop basis. Each packet is
classified upon entry into the network based on access lists, IP Precedence
or DSCP values, or VLAN lists. Using access lists allows you select traffic
based on Layer 2, Layer 3, or Layer 4 information contained in each
packet. Based on network policies, different kinds of traffic can be marked
for different kinds of forwarding.
ETHERNET RING
PROTECTION
SWITCHING
ERPS can be used to increase the availability and robustness of Ethernet
rings, such as those used in Metropolitan Area Networks (MAN). ERPS
provides Layer 2 loop avoidance and fast reconvergence in Layer 2 ring
topologies, supporting up to 255 nodes in the ring structure. It can also
function with IEEE 802.1ag to support link monitoring when non-
participating devices exist within the Ethernet ring.
OPERATION,
ADMINISTRATION, AND
MAINTENANCE
The switch provides OAM remote management tools required to monitor
and maintain the links to subscriber CPEs (Customer Premise Equipment).
This section describes functions including enabling OAM for selected ports,
loopback testing, and displaying remote device information.
IP ROUTING The switch provides Layer 3 IP routing. To maintain a high rate of
throughput, the switch forwards all traffic passing within the same
segment, and routes only traffic that passes between different
subnetworks. The wire-speed routing provided by this switch lets you
easily link network segments or VLANs together without having to deal
with the bottlenecks or configuration hassles normally associated with
conventional routers.
Routing for unicast traffic is supported with static routing, Routing
Information Protocol (RIP), Open Shortest Path First (OSPF) protocol, and
Border Gateway Protocol (BGP).
Static Routing – Traffic is automatically routed between any IP interfaces
configured on the ECN430-switch. Routing to statically configured hosts or
subnet addresses is provided based on next-hop entries specified in the
static routing table.
RIP – This protocol uses a distance-vector approach to routing. Routes are
determined on the basis of minimizing the distance vector, or hop count,
which serves as a rough estimate of transmission cost.