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What should I do if an error is reported during Eth-trunk configuration

Created: Dec 29, 2020 08:09:49Latest reply: Dec 29, 2020 08:10:14 246 3 0 0 0
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Hello everyone,

When Eth-Trunks is configured, no more than 128 Eth-Trunk resources are configured. However, when the number of Eth-Trunk resources reaches 98, a message "The Eth-Trunks have been used up by APs. Connect APs to the network through physical interfaces." is displayed.

Networking: S12700 -------- aggregation PoE switch -------- AP (The S12700 equipped with the WLAN service card is interconnected with the PoE switch through Eth-Trunk, ensuring network link redundancy. The AP is connected to the PoE switch.)

Configuration scripts:

interface Eth-Trunk1

 port link-type trunk

 port trunk allow-pass vlan 2 to 4094

interface Eth-Trunk2

 port link-type trunk

 port trunk allow-pass vlan 2 to 4094

interface Eth-Trunk97

 port link-type trunk

 port trunk allow-pass vlan 2 to 4094

wlan

 vap-profile name test

  forward-mode tunnel

  service-vlan 100

  ssid-profile test

  security-profile test

Please help me! Thank you!


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DDSN
Admin Created Dec 29, 2020 08:10:14

Hi Rengar,

Networking restriction: When an AP is connected to the AC using an Eth-Trunk, another Eth-Trunk is occupied for packet forwarding apart from the newly created one. Therefore, to prevent the number of Eth-Trunks from exceeding the specification of the device, properly allocate Eth-Trunks during network data planning.

Therefore, when an AP is connected to the switch using an Eth-Trunk, a corresponding hidden Eth-Trunk is created. Although no more than 128 Eth-Trunk resources is configured, the PoE switch connected to the AP occupies two Eth-Trunks actually. As a result, all resources are used up.

When all PoE switches are connected to the S12700 through Eth-Trunks, only half of Eth-Trunks (128/2 = 64) can be used.

Solution: Replan the network. If more than 64 PoE access switches are deployed, other switches can only connect to the core S12700 switch through a single link.

I hope it helps!


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IndianKid
IndianKid Created Dec 29, 2020 12:34:58 (0) (0)
great  
IndianKid
IndianKid Created Dec 29, 2020 12:35:27 (0) (0)
Great answer  
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(1) (0)
2#
DDSN
DDSN Admin Created Dec 29, 2020 08:10:14

Hi Rengar,

Networking restriction: When an AP is connected to the AC using an Eth-Trunk, another Eth-Trunk is occupied for packet forwarding apart from the newly created one. Therefore, to prevent the number of Eth-Trunks from exceeding the specification of the device, properly allocate Eth-Trunks during network data planning.

Therefore, when an AP is connected to the switch using an Eth-Trunk, a corresponding hidden Eth-Trunk is created. Although no more than 128 Eth-Trunk resources is configured, the PoE switch connected to the AP occupies two Eth-Trunks actually. As a result, all resources are used up.

When all PoE switches are connected to the S12700 through Eth-Trunks, only half of Eth-Trunks (128/2 = 64) can be used.

Solution: Replan the network. If more than 64 PoE access switches are deployed, other switches can only connect to the core S12700 switch through a single link.

I hope it helps!


View more
  • x
  • convention：

IndianKid
IndianKid Created Dec 29, 2020 12:34:58 (0) (0)
great  
IndianKid
IndianKid Created Dec 29, 2020 12:35:27 (0) (0)
Great answer  
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