Cisco ONS 15454 SDH - Cisco Proprietary RPR Shortest Path

17-34
Cisco ONS 15454 and Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide, R8.0
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.