We must review the conditions for establishing an eBGP peer relationship.
In the product documentation:
By default, an EBGP connection can be set up only on a directly-connected physical link.
In fact, there are two conditions here:
1. By default, the number of hops between EBGP neighbors is 1 hop.
2. The source addresses on both sides must be on the same network segment.
We are familiar with the first rule here, while the second rule is easily overlooked.
* On Huawei routers, when ebgp-max-hop 2 is configured, why can an eBGP peer relationship be established? The explanation is as follows: When ebgp-max-hop 2 is configured, an eBGP peer relationship can be established between routers through two hops. In this case, the device does not check whether the eBGP peer addresses are in the same network segment.
Comment
Notice: To protect the legitimate rights and interests of you, the community, and third parties, do not release content that may bring legal risks to all parties, including but are not limited to the following:
- Politically sensitive content
- Content concerning pornography, gambling, and drug abuse
- Content that may disclose or infringe upon others ' commercial secrets, intellectual properties, including trade marks, copyrights, and patents, and personal privacy
