Methods and systems for monitoring network routing
The disclosed methods and systems include collecting routing data from a plurality of network routers, and correlating the routing data across routers and across time to obtain network data. The network data can be streamed to a user in real-time and the user can interactively query the data. In one embodiment, interactive routing analyses, drill-down, and forensics can be performed using a repository of Border Gateway Protocol (BGP) update traffic. Alarms can be set to detect selected routing problems. In setting the alarms, the message data for each router can be processed in timestamp order. Current message data from each router can be compared with previous message data to determine a condition status. An alarm can be provided when the condition status meets a temporal correlation criterion and/or a spatial correlation criterion.
1. A method of mapping network stability, comprising:
receiving BGP updates from routers in a plurality of autonomous networks of a network wherein the BGP updates comprise one or more of a BGP announcement, announcing a feasible route to a destination, and a BGP withdrawal, announcing a withdrawal of a previously announced feasible route to the destination;
based at least in part on the BGP updates, determining, for at least one of the routers, at least one of a BGP announcement rate and a BGP withdrawal rate, each of the announcement and withdrawal rates relating, in part, to a number of feasible routes to the destination during a time frame, and the at least one of the determined BGP announcement and withdrawal rates being used to compute a network stability metric; and
based on the at least one of the determined BGP announcement rate and BGP withdrawal rate for the at least one router updating (i) a map of the network, the map comprising the feasible routes, and (ii) a database comprising a global routing table for the plurality of autonomous networks.
2. The method of claim 1 , wherein the global routing table includes route information for at least one autonomous network based on BGP updates from route neighbors of the at least one autonomous network.
3. The method of claim 1 , wherein determining for the at least one router at least one of a BGP announcement rate and a BGP withdrawal rate includes determining one of the plurality of autonomous networks that includes the at least one router.
4. The method of claim 1 , wherein each of the announcement and withdrawal rates relates to a rate at which the number of feasible paths to the destination is changing.
5. The method of claim 1 , wherein updating the global routing table comprises indicating, based on the at least one of the determined BGP announcement rate and BGP withdrawal rate, a number of distinct routable destinations during the time frame.
6. The method of claim 1 , wherein the network stability metric comprises at least one of a number of BGP announcements, a number of BGP withdrawals, a number of unreachable networks, a number of blackhole attacks, a size of the global routing table, or a listing of leading origins of instability.
7. A computer-implemented method of mapping network stability comprising:
receiving BGP updates from routers that exchange BGP updates with a plurality of autonomous networks of a network;
obtaining from the BGP updates at least one of a BGP announcement, announcing a feasible route to a destination, and a BGP withdrawal, announcing a withdrawal of a previously announced feasible route to the destination;
determining, for at least one autonomous network of the plurality of autonomous networks, at least one of a BGP announcement rate and a BGP withdrawal rate, each of the announcement and withdrawal rates relating, in part, to a number of feasible routes to the destination during a time frame, and the at least one of the determined BGP announcement and withdrawal rates being used to compute a network stability metric; and
based on at least one of the determined BGP announcement rate and BGP withdrawal rate for the at least one autonomous network, updating (i) a map of the network, the map comprising the feasible routes, and (ii) a database comprising a global routing table for the plurality of autonomous networks.
8. The method of claim 7 , wherein the global routing table includes route information for at least one autonomous network based on BGP updates from route neighbors of the at least one autonomous network.
9. The method of claim 7 , wherein determining, for the at least one autonomous network, at least one of a BGP announcement rate and a BGP withdrawal rate includes determining a BGP announcement rate or a BGP withdrawal rate for at least one router in the at least one autonomous network.
10. The method of claim 7 , wherein each of the announcement and withdrawal rates relates to a rate at which the number of feasible paths to the destination is changing.
11. The method of claim 7 , wherein updating the global routing table comprises indicating, based on the at least one of the determined BGP announcement rate and BGP withdrawal rate, a number of distinct routable destinations during the time frame.
12. The method of claim 7 , wherein the network stability metric comprises at least one of a number of BGP announcements, a number of BGP withdrawals, a number of unreachable networks, a number of blackhole attacks, a size of the global routing table, or a listing of leading origins of instability.