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Route distinguisher & Rou...

Route distinguisher & Route target

Created: Oct 25, 2020 02:02:11Latest reply: Nov 6, 2021 06:08:46 714 8 6 0 0
  Rewarded HiCoins： 1 (problem resolved)
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Hi guys,


Why Route distinguisher can't be used for the role of route target? Please provide an example. 


MPLS VPN

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(2) (0)
Popeye_Wang
Admin Created Oct 26, 2020 02:00:54

Hello,
Theoretically, RTs can be used without RDs.
However, RT is not a simple number. It is usually a list. In addition, RT is a route attribute and is not placed together with the IP prefix. Therefore, it is difficult to compare RTs. Especially, the Routewithdraw message of BGP does not carry any attribute. In this case, the received route does not have the RT. As a result, two identical routes are withdrawn.

Similarly, in theory, it is possible to use only RDs without RTs.
The RD can implement the RT function, but the RD is not flexible. (When two VRFs of the same PE need to communicate with each other, only using RD cannot implement the function.)
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  • x
  • convention：

Herediano
Herediano Created Oct 26, 2020 02:41:04 (0) (0)
Thank you @Popeye_Wang, It's clear now  
Unicef
Unicef Created Nov 6, 2021 06:08:35 (0) (0)
 
All Answers
(0) (0)
2#
jason_hu
jason_hu Admin Created Oct 25, 2020 02:02:44

Hello,
It's nice to meet you in the community.
We're working on your problem. Please be patient.
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  • convention：
(0) (0)
3#
jason_hu
jason_hu Admin Created Oct 25, 2020 03:30:11

Hello,
The route-distinguisher command configures a route distinguisher (RD) for a VPN instance address family. https://support.huawei.com/hedex/hdx.do?docid=EDOC1100069307&id=route-distinguisher_vpn_instance_view&lang=en
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  • x
  • convention：

Herediano
Herediano Created Oct 25, 2020 16:04:11 (0) (0)
Hi @JasonHu

Please explain why it can't RD be used for the same role as RT.  
(2) (0)
4#
Popeye_Wang
Popeye_Wang Admin Created Oct 26, 2020 02:00:54

Hello,
Theoretically, RTs can be used without RDs.
However, RT is not a simple number. It is usually a list. In addition, RT is a route attribute and is not placed together with the IP prefix. Therefore, it is difficult to compare RTs. Especially, the Routewithdraw message of BGP does not carry any attribute. In this case, the received route does not have the RT. As a result, two identical routes are withdrawn.

Similarly, in theory, it is possible to use only RDs without RTs.
The RD can implement the RT function, but the RD is not flexible. (When two VRFs of the same PE need to communicate with each other, only using RD cannot implement the function.)
View more
  • x
  • convention：

Herediano
Herediano Created Oct 26, 2020 02:41:04 (0) (0)
Thank you @Popeye_Wang, It's clear now  
Unicef
Unicef Created Nov 6, 2021 06:08:35 (0) (0)
 
(0) (0)
5#
ErickRodBej
ErickRodBej Created Oct 26, 2020 20:55:05

I have this problem too
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  • x
  • convention：
(0) (0)
6#
Unicef
Unicef MVE Created Nov 6, 2021 06:08:46

Good
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  • x
  • convention：
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