Hello, everyone! Today I want to share with you about the issue that failing to configure more Eth-trunks on S12700 switch.
【Problem Description】:
Failing to configure more Eth-trunks on S12700
【Problem Analysis】:
1．Run command “interface Eth-trunk104” to create a new Eth-trunk but it failed.
2. Run command “display trunk configuration” to check the number of the eth-trunks on S12700, we found that there are 128 configured Eth-trunks but when we checked the displayed trunk index-map and we found only 90 eth-trunks have been created.
3.Run command "display wlan-adp trunk brief" in diagnose mode to check the hidetrunk information, there are 38 hidetrunks.
4. S12700 Eth-trunk source is 128，and 128=90+38, so the trunk source runs out.
Notice：On the switch used as the WLAN AC, when the X card is deployed at the user side and connects to downstream APs through an inter-card Eth-Trunk, if the X card is used at the network side, the number of used Eth-Trunks cannot reach the value specified by this command and the minimum of used Eth-Trunks may be half of the value specified by this command.
5．We try to run command “assign trunk” to increase the Eth-trunk specifications, but it failed.
We need to run eth-trunk load-balance hash-mode to set the hash mode to advanced
6. When we try to run “eth-trunk load-balance hash-mode” to set the hash mode to advanced, the prerequisites is that all of the ports on the board need to quit from eth-trunk first.
7. As this is live network, we created RFC for the operation to proceed.
【Root Cause】:
Eth-trunk resource runs out
【Solution Description and Next PLan】:
1. Check if there are some Eth-trunks created but without service, you can use them rather than create new eth-trunks.
2. If you want to create more Eth-trunks, we RFC and downtime to operate. For example we need to quit all of the physical ports from the Eth-trunk, and we need to reboot the SVF system and so on.
