Alcatel OS6400-24 Betriebsanweisung PDF herunterladen (Seite 32)

August 2008

Page 32 of 55 OmniSwitch 6400------ Release 6.3.3.R01

SNMP

The Simple Network Management Protocol (SNMP) is an application-layer protocol that allows commu-

nication between SNMP managers and SNMP agents on an IP network. Network administrators use SNMP

to monitor network performance and to solve network problems. SNMP provides an industry standard

communications model used by network administrators to manage and monitor their network devices. The

OmniSwitch supports SNMPv1, SNMPv2, and SNMPv3.

Source Learning

Source Learning builds and maintains the MAC address table on each switch. New MAC address table

entries are created in one of two ways: they are dynamically learned or statically assigned. Dynamically

learned MAC addresses are those that are obtained by the switch when source learning examines data

packets and records the source address and the port and VLAN it was learned on. Static MAC addresses

are user defined addresses that are statically assigned to a port and VLAN.

In addition, Source Learning also tracks MAC address age and removes addresses from the MAC address

table that have aged beyond the configurable aging timer value.

Accessing MAC Address Table entries is useful for managing traffic flow and troubleshooting network

device connectivity problems.

L2 Static Multicast Addresses - Static multicast MAC addresses are used to send traffic intended for a

single destination multicast MAC address to multiple switch ports within a given VLAN. A static multicast

address is assigned to one or more switch ports for a given VLAN. The ports associated with the multicast

address are then identified as egress ports. When traffic received on ports within the same VLAN is

destined for the multicast address, the traffic is forwarded on the egress ports that are associated with the

multicast address.

One of the benefits of using static multicast addresses is that multicast traffic is switched in hardware and

no longer subject to flood limits on broadcast traffic.

Software Rollback

The directory structure inherent in an OmniSwitch switch allows for a switch to return to a previous, more

reliable version of image or configuration files.

Changes made to the configuration file may alter switch functionality. These changes are not saved unless

explicitly done so by the user. If the switch reboots before the configuration file is saved, changes made to

the configuration file prior to the reboot are lost.

Likewise, new image files should be placed in the working (non-certified) directory first. New image or

configuration files can be tested to decide whether they are reliable. Should the configuration or image files

prove to be less reliable than their older counterparts in the certified directory, then the switch can be

rebooted from the certified directory, and “rolled back” to an earlier version.

Once the contents of the working directory are established as good files, then these files can be saved to the

certified directory and used as the most reliable software to which the switch can be rolled back to in an

emergency situation.

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Alcatel OS6400-24 Betriebsanweisung Seite 32