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Memory at PE

  • From: "Liu, Chia J (Charlie), ALCNS" <cliu@att.com>
  • Date: Tue, 23 Apr 2002 12:49:16 -0400
  • Thread-Index: AcHq35dagpWwgr27Qn2WIumWaXnSagABEo4w
  • Thread-Topic: Memory at PE
  • X-MIME-Autoconverted: from quoted-printable to 8bit by cell.onecall.net id g3NGo1k30403

Sachin,

There are two aspects:
*	Memory Usage in GRP/RSP:   In the lab, we saw data of ~935 bytes per VPN prefix in VRF, compared to 500-600 bytes per internet prefix in global routing table.    I heard there is additional 60KB-70KB overhead per VRF.
*	Memory Usage in Line Card:   We are particularly concerned about the VRF memory overhead in PSA/TLU of E2 16xOC-3 in GSR.    It looks like the number is different in different IOS releases.    I am interested in knowing if anyone has number on this.   Thanx.

C.J. (Charlie) Liu


> -----Original Message-----
> From:	Sachin Kalra [SMTP:skalra@opnet.com]
> Sent:	Tuesday, April 23, 2002 11:51 AM
> To:	mpls@UU.NET
> Subject:	Memory at PE
> 
> Dear Group:
> 
> I would appreciate if I can get answer to the following question regarding 
> BGP/MPLS VPNs (RFC2547bis)
> 
> I understand that PE router maintains a separate VRF table for each VPN 
> site connected to it. I wanted to know if a PE also maintain separate RIBs 
> for each VPN site, apart from its main Local RIB? Or, does it maintain only 
> one single RIB?
> 
> Actually, I was looking from the perspective of amount of memory required 
> at PE, if it has to maintain many VRFs and many RIBs.
> 
> Thanks for your response.
> Sachin Kalra