Tripp Lite NGI-M08C4-L2, Руководство пользователя

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Announce Interval
Add - configures to send periodical announce messages in
specified intervals in PTP port.
Default - deletes existing announce interval from PTP port and
adds default interval (1).
Announce Timeout
Add - configures specified value as announce time in PTP port.
Default - deletes existing announce timeout from PTP port and
adds default timeout (3).
Vlan ID
Add - configures specified VLAN list to PTP port.
Remove - deletes specified VLAN list from PTP port.
Apply
Click Apply to take effect the settings.
Refresh
Click Refresh to begin configuring this screen afresh.
6.12 PPPoE IA
PPPoE Intermediate Agent (PPPoE IA) is placed between a subscriber and BRAS to help the
service provider BRAS distinguish between end hosts connected over Ethernet to an access
switch. On the access switch, PPPoE IA enables Subscriber Line Identification by appropriately
tagging Ethernet frames of different users (The tag contains specific information like which
subscriber is connected to the switch and VLAN). PPPoE IA acts as mini security firewall
between host and BRAS by intercepting all PPPoE Active Discovery (PAD) messages on a per-
port per-vlan basis. It provides specific security feature such as verifying the intercepted PAD
message from untrusted port, inserting and removing VSA Tags (vendor-specific tag) into and
from PAD messages.