Why cannot some S3752 series switches establish stacks?

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Run the display version command on an S3752 switch.
[Unit 0] EMFEA uptime is 0 day, 11 hours, 8 minutes
128M bytes DDR Memory
16M bytes FLASH
Pcb Version : CX22EMFEA REV A
Basic BOOTROM Version : 209 Compiled at Nov 6 2010, 16:31:25
Software Version : VRP (R) Software, Version 5.70 (S3752 V100R005C01)
If the version of the printed circuit board (PCB) is CX22EMFEA REV A, the switch does not support stacking.

Other related questions:
Why some S3752 switches cannot set up a stack
An S3752 does not support the stacking function if it uses a print circuit board (PCB) of version A. Run the display version command on the S3752. If the following information is displayed, the S3752 uses a PCB of version A. [Unit 0] EMFEA uptime is 0 day, 11 hours, 8 minutes 128M bytes DDR Memory 16M bytes FLASH Pcb Version : CX22EMFEA REV A Basic BOOTROM Version : 209 Compiled at Nov 6 2010, 16:31:25 Software Version : VRP (R) Software, Version 5.70 (S3752 V100R005C01)

Problem and solution when BGP peer cannot be established
The BGP peer establishment on the firewall needs to use port 179 to establish TCP sessions and requires that OPEN messages be properly exchanged. Perform as follows to rectify the issue: 1. Check whether the AS number and IP address among peers are correct by using the display bgp peer command. 2. Check whether the router IDs configured on both BGP peers are conflicting by using the display bgp peer command. 3. If the loopback interface is used, check whether the peer connect-interface command is configured to specify the loopback interface as the source interface for sending BGP packets. 4. If EBGP neighbors are not directly connected to the physical layer, check whether the peer ebgp-max-hop command is configured. 5. Check whether there are available routes to the peer in the routing table. 6. Check whether there are reachable routes to the specified connect-interface by using the ping -a source-ip-address host-address command. 7. Check whether the ACL that is used to disable TCP port 179 is configured.

Why Is the Resource ID of Some Traces in the Trace List a Hyperlink?

After you click Resource ID of a trace, a page that shows details of the cloud resource is displayed. Currently, only some operation records of ECS, EVS, VBS, IMS, AS, CES, and VPC can be recorded, and more operation records will be supported in the future.


Reason for ping packet loss on S series switch
For S series modular switches: Ping packets sent from other devices to a switch are processed by the switch as fib-hit packets. The switch sends fib-hit packets to the CPU at the default CAR value to protect the CPU from being attacked by these packets. If the rate of ping packets sent to the CPU exceeds the CAR value, the switch discards the excess packets. To resolve the problem, set a larger CAR value for fib-hit packets.

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