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ME60 V800R010C10SPC500 Feature Description - WAN Access 01

This is ME60 V800R010C10SPC500 Feature Description - WAN Access
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Route Iteration

Route Iteration

Routes can be used to forward traffic only when they have directly connected next hops. However, this condition may not be met when routes are generated. Therefore, the system needs to search for the directly connected next hops and corresponding outbound interfaces, and this process is called route iteration. In most cases, BGP routes, static routes, and UNRs do not have directly connected next hops, and route iteration is required.

For example, the next hop IP address of a BGP route is the IP address of a non-directly connected peer's loopback interface, and therefore, the BGP route needs to be iterated. Specifically, the system searches the IP routing table for a direct route (IGP route in most cases) that is destined for the next hop IP address of the BGP route and then adds the next hop IP address and outbound interface of the IGP route to the IP routing table to generate a FIB entry.

The next hop IP address of a BGP VPN route is the IP address of a non-directly connected PE's loopback interface, and the BGP route needs to be iterated to a tunnel. Specifically, the system searches the tunnel list for a tunnel that is destined for this loopback IP address and then adds the tunnel information to the routing table to generate a FIB entry.

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Updated: 2019-01-04

Document ID: EDOC1100059473

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