Encapsulation
ENCAPSULATIONSelection of an encapsulation protocol from the modem to the service provider occurs on a per virtual circuit (session) basis. For example, for the 700F you can configure 32 sessions for
PPPover ATM mode and configure another 32 sessions for RFC 1483 mode. However, you can activate only PPP over ATM sessions or RFC 1483 sessions at a time. You cannot concurrently activate PPP sessions and RFC 1483 sessions for all Megabit Modems.
When you activate RFC 1483 system mode, you can select WAN encapsulation as
| PPP |
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Link Control Protocol | Provides a phase of the PPP negotiation by setting up the physical link (RFC |
(LCP) | 1661). |
Network Control | Occurs after LCP, negotiating parameters for each network interface and uses |
Protocol (NCP) | Internet Protocol Control Protocol (IPCP) which is defined in RFC 1332. |
Authentication | Provides authentication of PPP sessions for security through Password and |
(PAP/CHAP) | |
Network Address | Network Address Port Translation (NAPT) maps LAN side private IP address to |
Translation | the public IP address assigned to the 32 virtual channels (RFC 1631). You can |
| map to two private addresses to each of the 32 sessions for a total of 64 |
| addresses. |
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| Routing |
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Routing Protocol | Supports RFC 1724 Routing Information Protocol (RIP and RIP Version 2). |
Encapsulation | Supports Logical Link Control (LLC) or |
Static Routes | Supports up to 32 static routes |
Address Resolution | Supports Address Resolution Protocol (ARP) over the LAN port (RFC 826) |
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| Bridging |
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Bridging and Address | Implements a transparent learning bridge with a bridging table of 1024 entries. |
Learning |
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Encapsulation | Supports Logical Link Control (LLC) or |
Spanning Tree | Provides Spanning Tree support per IEEE 802.1d. |
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96 | Megabit Modem 400F, 500L, 600F, and 700F User Manual |