Optics

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Extra resources for Cisco - Advanced Optical Technology Concepts 606

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0 mfr-jc1(config-if)#no shut 606 0921_04F9_c3 © 1999, Cisco Systems, Inc. 111 Configuration Commands mfr-jc1(config-if)#int srp 0/0 mfr-jc1(config-if)#srp ? clock-source Configure clock source count Count packets based on source mac address flag Specify SONET/SDH overhead values framing Specify SONET/SDH framing and corresponding s1s0 defaults ips Modify IPS parameters reject Reject packets based on source mac address topology-timer Specify topology timer 606 0921_04F9_c3 © 1999, Cisco Systems, Inc.

All rights reserved. Printed in USA. scr 64 32 Ring Selection • Ring selection is done by ARP’ing A B • ARP request is sent on Outer and Inner ring in alternating order • Responding node uses its topology map to determine which ring to send the respond • Requesting node uses respond to determine ring selection 606 0921_04F9_c3 D ARP Respond ARP Request C Topology Map 65 © 1999, Cisco Systems, Inc. Ring Selection • When a node detects a ring wrap it issues a gratuitous ARP which is used to update the ARP table of all nodes on the ring • Static ARP can be used to force the selection of a particular ring 606 0921_04F9_c3 © 1999, Cisco Systems, Inc.

Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 92 46 IPS Operation X Wrapped {SF,B,W,S} A {SF,A,W,L} B Wrapped Fiber Cut {SF,A,W,S} X {SF,B,W,L} D C Pass-Through Pass-Through 2 Fiber Failure 606 0921_04F9_c3 93 © 1999, Cisco Systems, Inc. IPS Operation Signal Degrade {0,B,W,S} A B {SD,A,W,L} {SD,A,W,S} {SD,B,W,L} D C Signal Degrade 606 0921_04F9_c3 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. scr 94 47 IPS Operation Signal Degrade {SF,B,W,L} A B {SF,B,W,S} X Fiber Cut C X D {SF,D,W,S} Signal Degrade and Fiber Failure 606 0921_04F9_c3 95 © 1999, Cisco Systems, Inc.

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