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BFD link-bundle in NE40x8...

BFD link-bundle in NE40x8 IOS V8R10

Created: Jun 18, 2021 18:22:13Latest reply: Jun 21, 2021 05:43:13 402 11 0 0 0
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Dears,


The objective was to increase the network resiliency by using BFD on our links without too much administrative overhead. Thus, and according to the NE40E documentation, we implemented link-bundle BFD sessions as an alternative solution to the static BFD sessions. 


Based, on the documentation the feature should put interfaces in protocol downstate [down(b)] when the BFD session goes down. However, after testing the behavior the result was that the BFD main and sub session’s status didn’t affect the interfaces’ status in any way ( eth-trunks and their members).


BFD session gets down once link failure has occurred, but it doesn't reflect its status to any of interface status nor eth-trunk member status.


Kindly help to clarify the issue.


as a side note, I did this on eNSP lab using NE40 product and it was perfect.



Thank you in advance 




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chenhui
Admin Created Jun 21, 2021 05:43:13

Posted by Shark_85 at 2021-06-18 19:49 Thank u The provided link is related to vrrp bfd not what I was mention in my original post. Bfd l ...
Hello,
By default, the BFD session status will not be reflected in the physical interface state.
If you want the BFD session status being reflected in the physical interface state, you can configure the [oam-bind ingress bfd-session trigger if-down egress interface] or [process-interface-status].
For the first command configuration, when a link fault is detected, the BFD session on the local device informs the OAM management module, which triggers the physical status of the interface to go Down. When the faulty link recovers, the BFD session on the local device informs the OAM management module, which triggers the interface to go Up.
For the second command configuration, If a BFD session detects a fault and goes Down, the associated interface status becomes BFD_Down. As a result, the direct route of the interface is deleted from the routing table, and BFD packets can still be sent.
For more detailed information, please refer to (https://support.huawei.com/hedex/hdx.do?docid=EDOC1100075471&id=oam-bind_ingress_bfd-session_trigger_if-down_egress_interface&lang=en) and (https://support.huawei.com/hedex/hdx.do?docid=EDOC1100075471&id=process-interface-status&lang=en)
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Shark_85
Shark_85 Created Jul 2, 2021 23:21:22 (0) (0)
Thank you,

But what kind of benefit can I get from enabling BFD link-bundle feature?  
chenhui
chenhui Reply Shark_85  Created Jul 3, 2021 04:35:56 (0) (0)
If the Eth-Trunk fails and common BFD is used, only one single-hop BFD session is created. After the creation is complete, BFD selects the board on which a member interface resides as a state machine board and monitors the member interface. If the member interface or state machine board fails, BFD considers the entire Eth-Trunk failed even if other member interfaces of the Eth-Trunk are Up. BFD for link-bundle resolves this issue.  
chenhui
chenhui Reply Shark_85  Created Jul 3, 2021 04:36:46 (0) (0)
BFD for link-bundle consists of one main session and multiple sub-sessions, the main session creates a BFD sub-session for each Eth-Trunk member interface, summarizes the sub-session monitoring results, and determines the status of the Eth-Trunk.  
chenhui
chenhui Reply Shark_85  Created Jul 3, 2021 04:38:10 (0) (0)
In other words, BFD for link-bundle provides a more reliable way than the BFD does.  
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Gustavo.HdezF
Gustavo.HdezF Admin Created Jun 18, 2021 18:25:25

Hello User. we are reviewing your question and we will answer you shortly. Thanks.
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Gustavo.HdezF
Gustavo.HdezF Admin Created Jun 18, 2021 19:19:52

if the behavior is not as expected I suggest you open a ticket with technical support to report the issue to have an better answer about this situation.

Regards.
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Shark_85
Shark_85 Created Jun 18, 2021 19:30:39

Posted by Gustavo.HdezF at 2021-06-18 19:19 if the behavior is not as expected I suggest you open a ticket with technical support to report the ...

I want to get sure that this feature could turn down the eth-trunk member or not In Case of link failure?
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sachandio
sachandio Created Jun 18, 2021 19:43:09

Hi,
Please refer to below link
https://support.huawei.com/hedex/hdx.do?docid=EDOC1000163385&id=dc_cfg_vrrp_0046&lang=en

If issue resolved from above link, otherwise please download latest version from the below link

http://files.610.knu.ua/Huawei/eNSP/V100R003C00SPC100/

Hope it will helpful
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Shark_85
Shark_85 Created Jun 18, 2021 19:49:01

Posted by sachandio at 2021-06-18 19:43 Hi, Please refer to below link https://support.huawei.com/hedex/hdx.do?docid=EDOC1000163385&id=dc_cf ...
Thank u

The provided link is related to vrrp bfd not what I was mention in my original post.
Bfd link-bundle is new feature in NE40
I already tested in the latest version.
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7#
jason_hu
jason_hu Admin Created Jun 19, 2021 02:01:34

Hi friend!
1. Check whether the BFD session is successfully established. 2. Can you send the BFD configuration information?
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8#
chenhui
chenhui Admin Created Jun 21, 2021 05:43:13

Posted by Shark_85 at 2021-06-18 19:49 Thank u The provided link is related to vrrp bfd not what I was mention in my original post. Bfd l ...
Hello,
By default, the BFD session status will not be reflected in the physical interface state.
If you want the BFD session status being reflected in the physical interface state, you can configure the [oam-bind ingress bfd-session trigger if-down egress interface] or [process-interface-status].
For the first command configuration, when a link fault is detected, the BFD session on the local device informs the OAM management module, which triggers the physical status of the interface to go Down. When the faulty link recovers, the BFD session on the local device informs the OAM management module, which triggers the interface to go Up.
For the second command configuration, If a BFD session detects a fault and goes Down, the associated interface status becomes BFD_Down. As a result, the direct route of the interface is deleted from the routing table, and BFD packets can still be sent.
For more detailed information, please refer to (https://support.huawei.com/hedex/hdx.do?docid=EDOC1100075471&id=oam-bind_ingress_bfd-session_trigger_if-down_egress_interface&lang=en) and (https://support.huawei.com/hedex/hdx.do?docid=EDOC1100075471&id=process-interface-status&lang=en)
View more
  • x
  • convention：

Shark_85
Shark_85 Created Jul 2, 2021 23:21:22 (0) (0)
Thank you,

But what kind of benefit can I get from enabling BFD link-bundle feature?  
chenhui
chenhui Reply Shark_85  Created Jul 3, 2021 04:35:56 (0) (0)
If the Eth-Trunk fails and common BFD is used, only one single-hop BFD session is created. After the creation is complete, BFD selects the board on which a member interface resides as a state machine board and monitors the member interface. If the member interface or state machine board fails, BFD considers the entire Eth-Trunk failed even if other member interfaces of the Eth-Trunk are Up. BFD for link-bundle resolves this issue.  
chenhui
chenhui Reply Shark_85  Created Jul 3, 2021 04:36:46 (0) (0)
BFD for link-bundle consists of one main session and multiple sub-sessions, the main session creates a BFD sub-session for each Eth-Trunk member interface, summarizes the sub-session monitoring results, and determines the status of the Eth-Trunk.  
chenhui
chenhui Reply Shark_85  Created Jul 3, 2021 04:38:10 (0) (0)
In other words, BFD for link-bundle provides a more reliable way than the BFD does.  
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