DSCP、IP-Precedence、802.1P trust

Created: Oct 22, 2019 11:55:42Latest reply: Oct 22, 2019 11:59:13 53 1 0 0
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S5300 When both trust dscp and trust 802.1p are configured, which priority takes effect?

  • x
  • convention:

Featured Answers
jason_hu
Admin Created Oct 22, 2019 11:59:13 Helpful(0) Helpful(0)

Hello@listena
For S series fixed switches, both trust dscp and trust 8021p can be configured on the same interface, or both trust ip-precedence and trust 8021p can be configured. When both of the following conditions are met:
- If the packet is a Layer 3 packet, the interface trusts the dscp value or IP priority of the packet.
- If the packet is a Layer 2 packet, the interface trusts the 802.1p value of the packet.
Note:
Dscp and IP precedence are obtained from different bits of the same tos field in packets. Therefore, trust dscp and trust ip-precedence cannot be configured on the same interface at the same time.
S5300HI can be configured with trust dscp, trust 8021p inner, or trust 8021p outer on an interface, but cannot be configured at the same time.
The S5320LI and S5320SI do not support the trust ip-precedence command. I hope to answer your question.
  • x
  • convention:

All Answers
jason_hu
jason_hu Admin Created Oct 22, 2019 11:59:13 Helpful(0) Helpful(0)

Hello@listena
For S series fixed switches, both trust dscp and trust 8021p can be configured on the same interface, or both trust ip-precedence and trust 8021p can be configured. When both of the following conditions are met:
- If the packet is a Layer 3 packet, the interface trusts the dscp value or IP priority of the packet.
- If the packet is a Layer 2 packet, the interface trusts the 802.1p value of the packet.
Note:
Dscp and IP precedence are obtained from different bits of the same tos field in packets. Therefore, trust dscp and trust ip-precedence cannot be configured on the same interface at the same time.
S5300HI can be configured with trust dscp, trust 8021p inner, or trust 8021p outer on an interface, but cannot be configured at the same time.
The S5320LI and S5320SI do not support the trust ip-precedence command. I hope to answer your question.
  • x
  • convention:

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