| 摘要 |
A network is disclosed that includes a first tier of forwarding agents connected to a first tier of network devices. A second tier of forwarding agents is connected to a second tier of network devices. A service manager is configured to receive a packet from one of the forwarding agents; determine the tier of the forwarding agent; and send an instruction to the forwarding agent directing the forwarding agent to forward the packet to a network device connected to the tier of forwarding agents that includes the forwarding agent. filed Jul. 2, 1999 (Attorney Docket No. CISCP519) entitled SENDING INSTRUCTIONS FROM A SERVICE MANAGER TO FORWARDING AGENTS ON A NEED TO KNOW BASIS which is incorporated herein by reference for all purposes; and co-pending U.S. patent application Ser. No. 09/347,126, filed Jul. 2, 1999 (Attorney Docket No. CISCP520) entitled DISTRIBUTION OF NETWORK SERVICES AMONG MULTIPLE SERVICE MANAGERS WITHOUT CLIENT INVOLVEMENT, filed Jul. 2, 1999 which is incorporated herein by reference for all purposes; and co-pending U.S. patent application Ser. No. 09/347,034, filed Jul. 2, 1999 (Attorney Docket No. CISCP521) entitled INTEGRATING SERVICE MANAGERS INTO A ROUTING INFRASTRUCTURE USING FORWARDING AGENTS which is incorporated herein by reference for all purposes, and co-pending U.S. patent application Ser. No. 09/347,048, filed Jul. 2, 1999 (Attorney Docket No. CISCP522) entitled SYNCHRONIZING SERVICE INSTRUCTIONS AMONG FORWARDING AGENTS USING A SERVICE MANAGER which is incorporated herein by reference for all purposes; and co-pending U.S. patent application Ser. No. 09/347,125, filed Jul. 2, 1999 (Attorney Docket No. CISCP527) entitled BACKUP SERVICE MANAGERS FOR PROVIDING RELIABLE NETWORK SERVICES IN A DISTRIBUTED ENVIRONMENT which is incorporated herein by reference for all purposes; and co-pending U.S. patent application Ser. No. 09/347,123, filed Jul. 2, 1999 (Attorney Docket No. CISCP528) entitled STATEFUL FAILOVER OF SERVICE MANAGERS which is incorporated herein by reference for all purposes; and co-pending U.S. patent application Ser. No. 09/347,109, filed Jul. 2, 1999 (Attorney Docket No. CISCP529) entitled NETWORK ADDRESS TRANSLATION USING A FORWARDING AGENT which is incorporated herein by reference for all purposes; and co-pending U.S. patent application Ser. No. 09/347,036, filed Jul. 2, 1999 (Attorney Docket No. CISCP530) entitled PROXYING AND UNPROXYING A CONNECTION USING A FORWARDING AGENT, which is incorporated herein by reference for all purposes; and co-pending U.S. patent application Ser. No. 09/651,436, filed Aug. 30, 2000 (Attorney Docket No. CISCP536) entitled DISTRIBUTED RULE-BASED PACKET REDIRECTION, which is incorporated herein by reference for all purposes.
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