Routing
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IBGP flap when MX80 received 1.3m full internet route?

‎08-04-2019 10:51 AM

Hi all,

 

Is it it normal when MX80 received full EBGP router around 1.2m  from two upstream it will make IBGP flap. Below is the CPU and memory during the issue. Thanks and appreciate any feedback.

 

run show chassis routing-engine
Routing Engine status:
Temperature 44 degrees C / 111 degrees F
CPU temperature 58 degrees C / 136 degrees F
DRAM 2048 MB (2048 MB installed)
Memory utilization 80 percent
5 sec CPU utilization:
User 62 percent
Background 0 percent
Kernel 36 percent
Interrupt 1 percent
Idle 0 percent
1 min CPU utilization:
User 78 percent
Background 0 percent
Kernel 21 percent
Interrupt 1 percent
Idle 0 percent
5 min CPU utilization:
User 72 percent
Background 0 percent
Kernel 18 percent
Interrupt 1 percent
Idle 8 percent
15 min CPU utilization:
User 55 percent
Background 0 percent
Kernel 15 percent
Interrupt 1 percent
Idle 29 percent
Model RE-MX80-P

 

1 REPLY 1
Routing

Re: IBGP flap when MX80 received 1.3m full internet route?

‎08-04-2019 12:59 PM

Hi,

 

From what it looks, your MX80 is under both CPU (100% last 1 minute) and memory pressure(80%) . Thus it is likely to flap other protocols.

 

Need further check a few things:

1. What version is running on MX80?

2. rpd is likely to consume high memory if you receive 2 copies of internet routes. But let's check "show system processes extensive" and see apart from rpd, what else is consuming high memory(maybe you also have sampling enabled) ?

3. For your IBGP (or probably other protocols), is it one time flap or continuous flap? If this is one time flap, that means system is not able to keep up with the changes of route update. This can be avoided by tuning protocol timers, disable traceoption. If this is continuous flap, it would point to scaling limit or some other issues 

 

A few log stamps you can search in your "show log messages" file (but not limited to those) 

RLIMIT, PFE_VETO, SLIP, CORE, THRASH 


Mengzhe Hu
JNCIE x 3 (SP DC ENT)