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PTX router automatically uses remaining PFEs to route traffic if one of them dies?

3 weeks ago

Hi, 

If I disable one of the PFEs, will PTX router use the remaining PFEs to route traffic. I think it does, just want some confirmation.

 

P

9 REPLIES 9
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Re: PTX router automatically uses remaining PFEs to route traffic if one of them dies?

3 weeks ago

What is the FPC type?

 

tks,

Abhishek

Routing

Re: PTX router automatically uses remaining PFEs to route traffic if one of them dies?

3 weeks ago

In general if a pfe is disabled (which happens sometimes due to fabric error or any other reason) the other pfes will work as expected.

Routing

Re: PTX router automatically uses remaining PFEs to route traffic if one of them dies?

3 weeks ago

You can check the pfe state with the following command

 

labroot@Switch> show chassis fpc errors
FPC Level Occurred Cleared Threshold Action-Taken Action
0 Minor 0 0 10 0 LOG|
Major 0 0 1 0 CM ALARM|
Fatal 4 0 1 4 CM ALARM|
Pfe-State: pfe-0 -ENABLED | pfe-1 -ENABLED | pfe-2 -ENABLED |

 

So if pfe-0 is disabled the other pfe, pfe-1 and pfe-2 shall function as expected

Routing

Re: PTX router automatically uses remaining PFEs to route traffic if one of them dies?

3 weeks ago

Hi,

 

First you need to make sure all your ECMP path has member across different PFEs, either ae bundle or parallel links 

Second, in most cases of single PFE failure, system will disable the PFE by disabling the WAN link. By protocol convergence, traffic is routed to other PFEs 

 

Hope this has addressed your concern 


Mengzhe Hu
JNCIE x 3 (SP DC ENT)
Routing

Re: PTX router automatically uses remaining PFEs to route traffic if one of them dies?

[ Edited ]
3 weeks ago

@Abhishek: The FPC type is JNP10001-36MR-PIC as seen below:

 

show chassis pic pic-slot 0 fpc-slot 0

 

FPC slot 0, PIC slot 0 information:

  Type                             JNP10001-36MR-PIC

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Re: PTX router automatically uses remaining PFEs to route traffic if one of them dies?

2 weeks ago

@mhu:

How can I verify that ECMP path has members across different PFEs?  Thanks.

 

P

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Solution
Accepted by topic author pluu
a week ago

Re: PTX router automatically uses remaining PFEs to route traffic if one of them dies?

2 weeks ago

Hi Pluu,

If one PFE wedges or doesn't function for some reason others will continue to function. Whether or not those PFE route traffic  totally depend on your network design.

You need to design your IP network in a way so that you have ECMP and your forwarding next-hops are on more than one PFE.

 

Here are some example and theory for your reference:

https://www.juniper.net/documentation/en_US/junos/topics/topic-map/ecmp-flow-based.html <<< this is for srx but concept remains same


https://www.juniper.net/documentation/en_US/junos/topics/usage-guidelines/policy-configuring-per-pac...

PS: Please accept my response as solution if it answers your query, kudos are appreicated too!

Thanks
Vishal

Routing

Re: PTX router automatically uses remaining PFEs to route traffic if one of them dies?

2 weeks ago

Hi ,

 

below documnet tells you the mapping of interface to the PFE for EX switches :

 

https://kb.juniper.net/InfoCenter/index?page=content&id=KB10963

 

For PTX I believe you will be able to get on the hardware 

for ECMP you need to have multiple ports connected to the same device probably at RTG or trunking which will ensure stable communication even incase of PFE failure 

 

Regards ,

Sharanya 

Routing

Re: PTX router automatically uses remaining PFEs to route traffic if one of them dies?

2 weeks ago