Extreme Networks ExtremeWare 7.7, Command Reference Manual

Page: 2303 / 2620

configure ppp ports
ExtremeWare 7.7 Command Reference Guide 2303
configure ppp ports
configure ppp [bcp [on | off] | ipcp [on {peer-ipaddress <ip address>} |
off]] ports <portlist>
Description
Configures the network control protocol that will run on the specified PPP ports.
Syntax Description
Default
By default, BCP is enabled on all PoS ports. (However, ports 2 and 4 of OC-3c modules are not
members of any VLANs by default; all other ports are members of the default VLAN by default.)
Usage Guidelines
The
bcp
keyword represents the bridging control protocol (BCP), and the
ipcp
keyword represents the
IP control protocol. IPCP and BCP are mutually exclusive configuration options for a given port (that is,
they cannot both be enabled simultaneously on the same port). Generally, when IPCP is enabled on a
port, the port must be a member of one and only one VLAN. Furthermore, no other ports can be
members of this VLAN, and IP routing is the only protocol supported on the VLAN. The one exception
to this rule occurs when SONET automatic protection switching (APS) is enabled. A single VLAN can
contain two IPCP-enabled ports if they are members of the same APS group.
The
peer-ipaddress
keyword provides an option to configure the IP address of the peer router. This
can be useful with peer routers that do not advertise their IP address using the IPCP IP address
configuration option (for example, Juniper routers). If the peer router does advertise an IP address via
IPCP, the configured
peer-ipaddress
is ignored.
BCP enables Ethernet MAC frames to be transported across a PPP link. Thus, any protocol can be
transported across a BCP connection. Essentially, BCP enables the PPP link to appear as an Ethernet
LAN segment to the rest of the switch. Therefore, the port may be a member of multiple VLANs, and
frames can be either bridged or routed onto the link. There are restrictions regarding which ports can be
bridged together (in other words, they may be members of the same VLAN) on the OC-3 PoS Module.
Ports 1 and 2 on the same OC-3 module cannot be bridged together (unless they are members of the
same APS group). Additionally, ports 3 and 4 on the same OC-3 module cannot be bridged together
(unless they are members of the same APS group). There are no similar restrictions regarding bridging
ports together on the OC-12 PoS Module.
PoS operation requires at least one Ethernet I/O module be operational in the chassis. IPCP cannot be
enabled on a port unless BCP is off, and vice versa. IPCP is recommended when a PoS port only carries
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.
peer-ipaddress Allows you to configure IP address of the peer router.
ip address Specifies IP address of the peer router.
portlist Specifies the port number(s).