Local-Area Networks and LAN Switching - CCIE Routing and Switching Exam Certification Guide - page 125

To ken Ring Frame Fields Descriptions (Continued) Table 4-7

Field Description

Data Contains the ULP information; this field is of variable size.

Frame Check Sequence (FCS) Contains the 32-bit cyclic redundancy check (CRC) for error detection.

End-delimiter (ED) Indicates the end of the Token Ring frame.

Frame Status Terminates a data/command frame. Included in the frame status are the

address-recognized and frame-copied bits.

To k en Ring Interface
As shown in Example 4-2, the Token ring interface maximum transmission unit (MTU), speed,
MAC, and other information can be checked with the show interface tokenring 0 command.
From the router output, you can see that the encapsulation is SNAP, the ring speed is 16 Mbps,
and the interface MTU is 4464 bytes.

To ken Ring Interface Example 4-2

router> show interface tokenring 0
TokenRing0 is up, line protocol is up
Hardware is TMS380, address is 0007.0d26.7612 (bia 0007.0d26.7612)
Internet address is 133.5.88.8/24
MTU 4464 bytes, BW 16000 Kbit, DLY 630 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation SNAP, loopback not set
Keepalive set (10 sec)
ARP type: SNAP, ARP Timeout 04:00:00
Ring speed: 16 Mbps
Duplex: half
Mode: Classic token ring station
Group Address: 0x00000000, Functional Address: 0x08000000
Ethernet Transit OUI: 0x000000
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of “show interface” counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue :0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
1278 packets input, 55402 bytes, 0 no buffer
Received 1007 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
331 packets output, 26189 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 output buffer failures, 0 output buffers swapped out
3 transitions

MTU 4464 bytes

Encapsulation SNAP