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MSTP Fast Convergence

Latest reply: Jan 25, 2021 17:18:15 195 17 6 0

MSTP supports both ordinary and enhanced Proposal/Agreement (P/A) mechanisms:

  • Ordinary P/A

The ordinary P/A mechanism supported by MSTP is implemented in the same manner as that supported by RSTP. For details about the P/A mechanism supported by RSTP, see Details About RSTP.

  • Enhanced P/A

Figure 1 Enhanced P/A mechanism

1

As shown in Figure 1, in MSTP, the P/A mechanism works as follows:

  1. The upstream device sends a proposal to the       downstream device, indicating that the port connecting to the downstream       device wants to enter the Forwarding state as soon as possible. After       receiving this BPDU, the downstream device sets its port connecting to       the upstream device to the root port, and blocks all non-edge ports.

  2. The upstream device continues to send an       agreement. After receiving this BPDU, the root port enters the Forwarding       state.

  3. The downstream device replies with an agreement.       After receiving this BPDU, the upstream device sets its port connecting       to the downstream device to the designated port, and the port enters the       Forwarding state.

By default, Huawei datacom devices use the enhanced P/A mechanism. If a Huawei datacom device needs to communicate with a non-Huawei device that uses the ordinary P/A mechanism, run the stp no-agreement-check command to configure the Huawei device to use the ordinary P/A mechanism. In this manner, these two devices can communicate with each other.

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IndianKid
Created Jan 9, 2021 05:42:05 Helpful(0) Helpful(0)

Well explained
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Hi..%20Let%26%23039%3Bs%20make%20some%20Routes%3Cbr%2F%3EHCIA%20R%26S%2C%20WLAN%2C%20and%20Security%20Certified
NTan33
Created Jan 10, 2021 04:56:55 Helpful(0) Helpful(0)

Great overview of MSTP.
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lucian2003
lucian2003 Created Jan 11, 2021 02:02:23
 
Someone%20new%20and%20curious%20about%20IT.
user_3015189
Created Jan 10, 2021 20:20:13 Helpful(1) Helpful(1)

Well done. Thanks
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lucian2003
lucian2003 Created Jan 11, 2021 02:02:09
 
Ballester
Ballester Reply lucian2003  Created Jan 11, 2021 20:24:50
 
Herediano
Created Jan 12, 2021 16:17:31 Helpful(2) Helpful(2)

Hi @lucian2003,


How does Enhanced P/A work when you have more than two switches on the MSTP region? You can take the following image as a reference for your explanation:

stp

Thanks in advance for your help!

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lucian2003
lucian2003 Created Jan 12, 2021 16:24:19
Thanks for your recomendation  
Faridrami
Faridrami Reply lucian2003  Created Jan 21, 2021 16:12:39
 
Ballester
Created Jan 15, 2021 16:00:44 Helpful(0) Helpful(0)

Thanks for sharing.
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lucian2003
lucian2003 Created Jan 21, 2021 16:11:11
 
Faridrami
Created Jan 15, 2021 18:59:32 Helpful(0) Helpful(0)

thank you
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lucian2003
lucian2003 Created Jan 21, 2021 16:11:02
 
Faridrami
Faridrami Reply lucian2003  Created Jan 21, 2021 16:12:17
 
andersoncf1
Created Jan 21, 2021 16:03:48 Helpful(0) Helpful(0)

Well done
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lucian2003
lucian2003 Created Jan 21, 2021 16:10:54
thanks  
Network%20Engineer%2C%20Post-Graduation%20in%20Computer%20Networks%20and%20Security%2C%20Possessing%20Certifications%20of%20Huawei%3A%20HCIE-R%26S%20(Written)%2C%202x%20HCIP-R%26S%20and%20Security%20and%203x%20HCIA-R%26S%2C%20Security%20and%20WLAN.
alopez
MVE Created Jan 25, 2021 17:18:15 Helpful(0) Helpful(0)

Nice. You are writing a lot. Hold on!!
Thank you!! :-)
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