Difference between OSPF and BGP

Created: Dec 18, 2018 17:14:55Latest reply: Dec 18, 2018 17:52:45 541 1 9 0

One is the internal route of the AS -ospf
One is the inter-AS route -bgp.
This is an essential difference.

OSPF is an Interior Gateway Protocol (IGP). It selects routes based on link status. Generally, OSPF runs in an AS. BGP is an external gateway protocol (EGP), which is usually used between ASs by ISP service providers, protocol used for Internet route selection. The route selection mode can be controlled by multiple clock attributes rather than the cost value of OSPF. BGP is an advanced route selection protocol based on the IGP protocol. That is, if you want to use BGP, you need to use the IGP protocol to implement the network.

OSPF is an Interior Gateway Protocol (IGP). It runs in an AS and uses the SPF algorithm to prevent loops in the AS. Because OSPF is calculated by each router itself, it is difficult to filter routes.
BGP is an EGP protocol and is a distance-vector routing protocol. To prevent loops, BGP adds many attributes to prevent loops. Generally, BGP is used between ASs for Internet route selection, BGP attributes can be modified to affect route selection. BGP does not calculate routes. Therefore, routes are filtered based on other routes. Therefore, it is easy to filter routes, and data can be easily distributed based on BGP attributes.

OSPF calculates routes based on link status.
BGP does not calculate routes but uses the routes generated by other protocols.
One is the production route, and the other is the routing. The OSPF production mode is precise to ensure that no loop exists, but multiple services are not supported. BGP is not produced and is used only for scheduling. Therefore, service support is good, and extended attributes make route planning a lot more choices.

  • x
  • convention:

yiyi0519  Visitor   Created Dec 18, 2018 17:52:45 Helpful(0) Helpful(0)

If BGP and OSPF routes need to be introduced to each other on the same device, how should the loop be prevented?
  • x
  • convention:

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