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OC12 Packet Over SONET Line Card Installation and Configuration

OL-3437-01

Chapter4 Configuring the OC12 POS Line Card

OC12 POS Statistics Counters

Configuring an Interface for Internal Loopback

The default loopback setting is for no loopback. With internal (or local) loopback, packets from the

router are looped back in the framer. Outgoing data gets looped back to the receiver without actually

being transmitted. Internal loopback is useful for checking that the OC12 POS line card is working.

To configure an interface for internal loopback, enter the loop internal command:

Router(config)# interface pos 3/0

Router(config-if)# loop internal

To disable internal loopback, enter the no loop internal command.

Configuring an Interface for Line Loopback

The default loopback setting is for no loopback. With line loopback, the receive (RX) fiber is logically

connected to the transmit (TX) optical fiber cable so that packets from the remote router are looped back

to it. Incoming data gets looped around and retransmitted without actually being received. To configure

an interface for line loopback, enter the loop line command:

Router(config)# interface pos 3/0

Router(config-if)# loop line

To disable line loopback, enter the no loop line command.

OC12 POS Statistics Counters

The OC12 POS line card maintains counts of certain errors. Each error counter is 32 bits. Errors include

the following:

• CRC errors—Packet corrupted in reception

• Giants received—Packet length too large (greater than MTU size)

• Runts—Packet length too small (less than or equal to 4 bytes)

• Ignores—No receive buffers available; receive buffers full

OC12 POS Line Card Error Messages

The only error messages you should see are of the following type and format:

%POS-1-INITFAIL: POS4/0 initialization failed

%POS-1-HWFAIL: POS OC12(4) Hardware failure. Primary DDLL not set. Deactivating line card.

%POS-3-FPGAREVNOTSUPPORTED:POS OC12(4) Line card requires fpga revision of (2).Current

fpga revision is (0)

%POS-3-FPGAREVNOTMATCH:POS OC12(4) Line card fpga requires min h/w revision of (0.0)

%POS-1-TRESFAIL:POS OC12(4/0) Failed to obtain PXF resources, error=16, shutting down

interface

%POS-1-HWFAIL:POS OC12(4) Hardware failure. Secondary DLL not set.

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Cisco 7300-6T3 Spezifikationen Seite 48