configure ppp
ExtremeWare 7.5 Command Reference Guide
2191
configure ppp
configure ppp [bcp [on | off] | ipcp [on | off]] [ports <portlist> |
multilink <groupname>]
Description
Configures the network control protocol (encapsulation) that will run on the specified PPP/MLPPP
WAN ports.
Syntax Description
Default
By default, BCP is enabled on all WAN ports.
Usage Guidelines
The packets passed over the PPP/MLPPP link can use either bridged or routed encapsulation. You
would use bridged packets if you plan to have more than one VLANs span the link. You would use
routed packets if the link connects two different routed networks or separate VLANs.
Using bridged packets allows the VLAN tags to be carried across the PPP/MLPPP link. Bridged packets
are transported using the PPP Bridging Control Protocol (BCP), described in RFC 2878, except in the
case of Legacy BCP, described below. When the encapsulation is set to BCP, 802.1Q and 802.1p
information is preserved and transported across the link.
Routed packets are transported across a PPP/MLPPP link using IP Control Protocol (IPCP), described in
RFC 1332. This is the encapsulation that is familiar to most users of PPP. The routed packets do not
contain Ethernet headers so cannot preserve VLAN tags. However, the WAN ports still must be added
as tagged ports to the VLAN that contains them. The module uses the tags internally and strips them
off before the packets are transmitted. The IP addresses used for the PPP/MLPPP link are taken from
the IP address assigned to the VLAN at each end of the link. The VLAN that contains the IPCP
encapsulated PPP/MLPPP ports cannot contain other ports. In other words, the only ports allowed in
the VLAN are those that make up the IPCP encapsulated link. There can only be one VLAN spanning
an IPCP-encapsulated link.
You must have one and only one encapsulation type configured on a PPP/MLPPP link. Setting BCP
encapsulation off implies that IPCP encapsulation is on. The default setting is BCP encapsulation on and
IPCP encapsulation off.
Legacy BCP.
Some routers supported by other vendors implemented BCP using an older standard,
RFC 1638. For interoperability, the Extreme Networks implementation supports both standards. The
limitation with RFC 1638-based BCP is that 802.1Q tags are not supported. So Legacy BCP cannot
bcp
Specifies bridging control protocol for the port.
ipcp
Specifies IP control protocol for the port.
on
Enables the designated protocol on the port.
off
Disables the designated protocol on the port.
portlist
Specifies the port number(s).
groupname
Specifies a previously created multilink group.
Summary of Contents for ExtremeWare 7.5
Page 402: ...402 ExtremeWare 7 5 Command Reference Guide VLAN Commands ...
Page 470: ...470 ExtremeWare 7 5 Command Reference Guide QoS Commands ...
Page 490: ...490 ExtremeWare 7 5 Command Reference Guide NAT Commands ...
Page 826: ...826 ExtremeWare 7 5 Command Reference Guide Commands for Status Monitoring and Statistics ...
Page 1090: ...1090 ExtremeWare 7 5 Command Reference Guide Security Commands ...
Page 1386: ...1386 ExtremeWare 7 5 Command Reference Guide Wireless Commands ...
Page 1436: ...1436 ExtremeWare 7 5 Command Reference Guide EAPS Commands ...
Page 1568: ...1568 ExtremeWare 7 5 Command Reference Guide ESRP Commands ...
Page 1844: ...1844 ExtremeWare 7 5 Command Reference Guide IGP Commands ...
Page 1930: ...1930 ExtremeWare 7 5 Command Reference Guide BGP Commands i Series Switches Only ...
Page 2022: ...2022 ExtremeWare 7 5 Command Reference Guide IP Multicast Commands ...
Page 2066: ...2066 ExtremeWare 7 5 Command Reference Guide IPX Commands i Series Platforms Only ...
Page 2082: ...2082 ExtremeWare 7 5 Command Reference Guide ARM Commands BlackDiamond Switch Only ...
Page 2094: ...2094 ExtremeWare 7 5 Command Reference Guide Remote Connect Commands ...
Page 2174: ...2174 ExtremeWare 7 5 Command Reference Guide PoS Commands BlackDiamond Switch Only ...
Page 2372: ...2372 ExtremeWare 7 5 Command Reference Guide LLDP Commands ...
Page 2422: ...2422 ExtremeWare 7 5 Command Reference Guide H VPLS Commands BlackDiamond Switch Only ...
Page 2528: ...2528 ExtremeWare 7 5 Command Reference Guide MPLS Commands BlackDiamond Switch Only ...