Cisco 15327 - Manual (Page 286)

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Ethernet Card Software Feature and Configuration Guide, R7.2
Chapter 17 Configuring Cisco Proprietary Resilient Packet Ring
Cisco Proprietary RPR Shortest Path
Hardware is POS-SPR, address is 0005.9a3b.c140 (bia 0000.0000.0000)
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation: Cisco-EoS-LEX, loopback not set
Keepalive not set
Unknown duplex, Unknown Speed, unknown media type
ARP type: ARPA, ARP Timeout 04:00:00
SPR Wrapped information:
POS0 : SONET
POS1 : SONET KEEPALIVE
No. of active members in this SPR interface: 0
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/0/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/0 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes
Received 0 broadcasts (0 IP multicast)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast
0 input packets with dribble condition detected
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Example 17-8 Show ons spr keepalive-info pos
Router> show ons spr keepalive-info pos 1
Keep-alive is configured and operational
Keep-alive state is up
Interface State: UP External Memory Location: 0xD
Num. KA pkts recvd: 461033198 Num KA pkts with KAF set: 930
StreamId: 79 Src Node: 040
KA Dead Val: 3 KA Restore Val: 10
Curr FSM State: FULL Prev FSM State: KAF COUNT
Prev FSM Event: RX KA Wrap/Unwrap Event: STATE_UP
Defect Soak Count: 200 KA Fail Count: 0
Cisco Proprietary RPR Shortest Path
The Cisco proprietary RPR shortest path feature determines the shorter hop-count of the two possible
paths that can take traffic from location A to location B.
Figure 17-14 illustrates a shortest path and
longest path for the same source and destination on a Cisco proprietary RPR. The shortest path from A
to B on the Cisco proprietary RPR is counter-clockwise, or east-to-west. The longest path is the opposite
direction, clockwise or west-to-east along the Cisco proprietary RPR.