Why does the state of the MSDP peer keep down though the MSDP peer relationship is set up

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You can run the peer peer-address connect-interface interface-type interface-number command on two ends to set up an MSDP peer relationship. The address of the interface specified by interface-type interface-number in the locally configured peer connect-interface command must be consistent with peer-address specified in the peer connect-interface command run on the remote end.

Other related questions:
Why does an SA filtering policy fail to take effect on the MSDP peer originating SA messages
The reason why the configuration of the peer peer-address sa-policy export [ acl advanced-acl-number ] command cannot take effect to filter the SA messages to be sent is: In the MSDP view, the import-source [ acl acl-number ] command creates a policy to filter local source information sent to other peers, whereas the peer peer-address sa-policy { export | import } [ acl advanced-acl-number ] configures a policy to filter SA messages to be forwarded. Therefore, the peer peer-address sa-policy export [ acl advanced-acl-number ] command cannot be used to filter locally originated SA messages. To configure an SA filtering on the RP where SA messages are originated, use the import-source [ acl acl-number ] command.

The state of an optical interface is not Up when it interconnects with the peer device
For the problem that the state of an optical interface is not Up when it interconnects with the peer device, see the troubleshooting guide. For details, access the URL in the right column.

The state of an E1 interface is not Up when the interface interconnects with the peer device
For the problem that the state of an E1 interface of an AR router is not Up when the interface interconnects with other devices, see the troubleshooting guide. For details, access the URL in the right column.

On S series switches, when BFD sessions in Down state receive packets in Up state sent from the peer end, how does the state change
S series switches with their BFD sessions in Down state do not change the status of BFD sessions to Up after receiving BFD Up packets from the remote end. If the link between two communication ends encounters an instant disconnection after the two ends become Up, one end that first detects the link Down event sends a BFD Down packet to the remote end. The remote end sends a BFD Up packet to the local end before receiving the BFD Down packet. The local end does not change its state after receiving the Up packet. This prevents network flapping.

Why are loopback addresses used to establish BGP peer relationships
Loopback interfaces are logical interfaces. Compared with physical interfaces, loopback interfaces are not affected by links and can reduce the Border Gateway Protocol (BGP) flapping.

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