What do the BGP peer states including Active, No Neg, and Idle(Admin) mean on S series switches

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In addition to Idle and Established, BGP Peer can be in other states including:

Active: indicates that the TCP connection is not set up for the BGP session.
No Neg: indicates that the ability to establish a BGP connection is not negotiated. Assume that one device is configured with IPv4 unicast, and the other device is configured with IPv4 unicast and IPv4 multicast. After the peer relationship is set up between the two devices, the device configured with IPv4 unicast only enters in Established state, whereas the other device configured with IPv4 unicast and IPv4 multicast enters in No Neg state. This is because one device is not configured with IPv4 multicast.
Idle (Admin): indicates that a peer is shut down and does not attempt to set up a connection. If the peer ignore command is executed on the peer or the status of the peer is set to Down through the related MIB, the peer is in Idle (Admin) state.

Other related questions:
Meanings of BGP peer status
In addition to the common Idle and Established status, BGP peer also has the following status: 1. active: indicates that the TCP connection of the BGP session has not been established. 2. no neg: indicates that the negotiation is not performed. If IPv4 Unicast is configured at one end, and IPv4 Unicast and IPv4 Multicast are configured at the other end, after the peer is established, you can discover that IPv4 Unicast negotiation succeeds, and the BGP peer is in Established status. However, the IPv4 Multicast is in no neg status in that IPv4 Multicast is not configured at one end. 3. Idle (Admin): indicates the BGP peer is proactively disabled, and there is no attempt to establish it again. If the peer ignore command is executed, or this peer is set to be down through the MIB, this peer remains in this status.

How to configure BGP for S series switches
For information about how to configure basic BGP functions on a S series switch, visit Example for Configuring Basic BGP Functions

On S series switches, what are the methods of defining the values of Hold and Keepalive timers on BGP peers
For S series switches that support BGP, the value of Hold and Keepalive timers can be set with the peer timer command. This command specifies the hold time when the BGP connection is interrupted and the interval for sending Keepalive messages. Large values of the two timers reduce the impact of link flapping, and small values enable the device to detect link changes. After the peer relationship is set up, the values of the two timers are negotiated by both peers, and the smaller ones are used.

APs in idle state and do not register with AC6005
What are the advantages for BGP peer relationships established using loopback interface addresses on S series switches
For S series switches that support BGP, loopback interfaces are logical interfaces and are steadily Up in most cases. Compared with physical interfaces, loopback interfaces are not affected by links, improving BGP neighboring stability.

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