SNMP Cache Proxy for Network Management Load Reduction
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Solution Overview
Problem
Network devices with minimal resources struggle to handle the query load from multiple network management systems using SNMP, as they are overwhelmed by frequent requests for timely statistics and configuration.
Innovation Solution
A caching proxy intercepts SNMP queries, categorizes objects based on characteristics, assigns time-to-live values, and caches responses, allowing it to serve subsequent requests from the cache without requerying the network device as long as the time-to-live value is valid, thereby reducing the load on the network device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple SNMP managers send frequent queries to obtain timely statistics and configuration, then the network management system can maintain up-to-date information, but the network device with minimal resources becomes overwhelmed and cannot handle the query load
Solution Approach 1:
The proxy pre-queries the network device for objects and stores them in a cache with time-to-live values before actual management queries arrive. This preliminary action allows the proxy to immediately respond to subsequent queries from multiple SNMP managers using cached data, eliminating the need for network devices to process every query and maintaining timely statistics without overwhelming the device.
Solution Approach 2:
The patent introduces a proxy as an intermediary component between SNMP managers and the network device. The proxy handles all query traffic, maintaining a cache of network device objects and responding to managers using cached data. This intermediary shields the resource-constrained network device from direct query loads while still enabling multiple managers to access timely information through the proxy's cached responses.
2Loss of time
If the proxy caches all objects with long time-to-live values, then query response time improves, but memory resources of the proxy are consumed
Solution Approach 1:
The proxy assigns different time-to-live values to different objects in the cache based on their specific characteristics and update frequencies. Frequently changing objects receive shorter TTLs while stable objects receive longer TTLs. This localized quality approach optimizes memory utilization by keeping only necessary objects in cache with appropriate retention periods, balancing response time improvement against memory resource consumption.
3Reliability
If the proxy forwards every request to the agent, then the network device receives accurate real-time data, but the resource burden on the network device increases
Solution Approach 1:
The proxy performs preliminary queries to the network device agent and stores the responses in a cache with appropriate time-to-live values. When subsequent queries arrive from SNMP managers, the proxy serves them from the cache rather than forwarding them to the agent. This preliminary action maintains data accuracy for the cache duration while dramatically reducing the processing load on the network device.
Solution Approach 2:
The proxy acts as an intermediary that maintains a cached representation of network device state. It forwards queries to the agent only when necessary (e.g., when cache entries expire or data needs updating), thereby maintaining data accuracy through periodic agent communication while reducing the frequency and burden of queries on the network device's limited resources.
Data Source
AI summary
In one embodiment, a proxy forwards a first request from a manager for an object in a management information base to an agent in a network device, the object describing a characteristic of the network device. The proxy receives the object from the agent and categorizes the object in a category of a plurality of categories based on a characteristic of the object. At least two categories in the plurality of categories are associated with different time-to-live values. The proxy caches the object from the agent with a time-to-live value in a cache, the time-to-live value associated with the category. Then, the proxy returns the object to the manager. The proxy responds to a second request for the object using the cached object while the time-to-live value is valid without having to forward the second request to the agent.