Foundry Networks Switch and Router User Manual

Using Packet Over SONET (POS) Modules
December 2000 6 - 11
Specifying the LMI Type
Foundry POS Frame Relay links use the Cisco-compatible LMI type by default. To specify a different LMI type,
enter a command such as the following:
BigIron(config-posif-2/1)# frame-relay lmi-type ansi
Syntax: [no] frame-relay lmi-type ansi | ccitt | lmi
The default is lmi.
Verifying the Configuration
To verify the POS Frame Relay configuration, enter commands such as the following:
BigIron(config-posif-2/1)# show interface pos 2/1
POS2/1 is up, line protocol is up
No port name
Hardware is Packet over Sonet
Internet address is 101.101.101.5/30
MTU 4470 bytes, encapsulation FR(cisco), clock is line
Framing is SONET, BW 155000Kbit, CRC 32
Loopback not set, keepalive is set (10 sec), scramble disabled
5 minute input rate: 112448 bits/sec, 135 packets/sec
5 minute output rate: 2394880 bits/sec, 204 packets/sec
7292298 packets input, 386668128 bytes, 0 no buffer
Received 0 CRCs, 0 shorts, 0 giants, 0 alignments
10029741 packets output, 14905847936 bytes, 0 underruns
The command in this example indicates that POS interface 2/1 is using the Cisco-compatible Frame Relay
encapsulation and the keepalive is enabled and set to 10 seconds.
BigIron(config-posif-2/1)# show interface brief slot 2
Port Link State Encap Clock Loop Speed mtu frame scram crc c2 j0 h1
2/1 up FR int none 622 4470 sonet no 32 cf cc 00
2/2 up FR int none 622 4470 sonet no 32 cf cc 00
This command shows brief interface information for the POS interfaces on the module in chassis slot 2.
Configuring POS for Layer 2 Switching
You can configure a POS port for Layer 2 switching. Layer 2 switching enables the devices on each end of a POS
link to exchange Ethernet frames over POS. Layer 2 switching over POS is especially useful for Virtual Private
Networking (VPN) applications in which IP hosts share a common sub-net even though the hosts are
geographically distant from one another.
NOTE: Foundry recommends that you use the default interface encapsulation, PPP, for POS ports configured for
Layer 2 switching.

Foundry Networks Switch and Router Specifications

General

Brand	Foundry Networks
Model	Switch and Router
Category	Switch
Language	English