View Of Logical Connectivity To Pos Ports With Ipcp Enabled - Extreme Networks PoS Installation And User Manual

Configuring the PoS Module
enabled on a PoS port, all data forwarded over the SONET link must be routed by the
BlackDiamond 6800 series switch, as illustrated in Figure 3-6.
1 2 3 4 A B 5 6 7 8
IP Router
192.168.9.1 192.168.10.1 192.168.11.1
VLAN a VLAN x VLAN y
PPP-IPCP PPP-IPCP
Ethernet Ethernet
PoS PoS
port 1 port n
port 1 port n
PoS_021
Figure 3-6: View of logical connectivity to PoS ports with IPCP enabled
Generally, when IPCP is enabled on a port, the port must be a member of one and only
one VLAN. Furthermore, no other ports may be members of this VLAN, and IP routing
is the only protocol supported on the VLAN. The one exception to this rule occurs
when APS is enabled. A single VLAN may contain two IPCP-enabled ports if they are
members of the same APS group.
Bridging Control Protocol. BCP establishes and configures a connection for
transporting Ethernet MAC frames across a PPP link. The BCP link must be established
successfully before data traffic can flow over the link. Because BCP carries Ethernet
MAC frames, any protocol can be transported across a BCP connection. In a simplified
sense, BCP allows the PoS link to appear as an Ethernet LAN segment to the rest of the
switch, so BCP makes it possible for LAN services to be extended transparently across
SONET wide-area networks. Therefore, the port can be a member of multiple VLANs,
and frames can be either bridged or routed onto the link, as illustrated in Figure 3-7.
3-24 Packet Over SONET Module Installation and User Guide