Re: [c-nsp] RAM for 4431 with full BGP table?
On 12/28/2017 04:10 PM, Gert Doering wrote: > Hi, > > On Thu, Dec 28, 2017 at 08:54:03PM +, Nick Cutting wrote: >> I would also like to know the answer to this. >> >> I always get scared and buy 16 gig if I'm taking in the full routing table. >> (4431/4451/4351 so far) >> >> I'm sure I could get away with 8. Not sure about 4, would love to know > > So how much memory do your routers use, if you have full tables? > > That should easily answer the question on whether 8 or 4 would suffice... > > A 7301 will take a full table in 1G RAM :-) https://www.cisco.com/c/en/us/products/collateral/routers/4000-series-integrated-services-routers-isr/white-paper-c11-734550.html "13. Scalability Tests [...] All Cisco 4000 platforms support a full Internet routing table (500,000 prefixes) @ 8-GB DRAM. The 4451 supports two full Internet routing tables (1 million prefixes) @ 16-GB DRAM." However, be careful: first, the full table is around 700K nowadays; second, the interpretation of "route". For an ASR 1K a "route" means "an entry in the RIB for each protocol" instead of "an entry in the routing table" so if your router has 2 upstreams, each sending its full-table through BGP it actually means you must size your router RAM to fit 2 full routing tables, not one. Best regards, Octavio. ___ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
Re: [c-nsp] RAM for 4431 with full BGP table?
Hi, On Thu, Dec 28, 2017 at 08:54:03PM +, Nick Cutting wrote: > I would also like to know the answer to this. > > I always get scared and buy 16 gig if I'm taking in the full routing table. > (4431/4451/4351 so far) > > I'm sure I could get away with 8. Not sure about 4, would love to know So how much memory do your routers use, if you have full tables? That should easily answer the question on whether 8 or 4 would suffice... A 7301 will take a full table in 1G RAM :-) gert -- now what should I write here... Gert Doering - Munich, Germany g...@greenie.muc.de signature.asc Description: PGP signature ___ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
Re: [c-nsp] RAM for 4431 with full BGP table?
I would also like to know the answer to this. I always get scared and buy 16 gig if I'm taking in the full routing table. (4431/4451/4351 so far) I'm sure I could get away with 8. Not sure about 4, would love to know -Original Message- From: cisco-nsp [mailto:cisco-nsp-boun...@puck.nether.net] On Behalf Of Adam Greene Sent: Thursday, December 28, 2017 10:30 AM To: 'Cisco-nsp List' <cisco-nsp@puck.nether.net> Subject: [c-nsp] RAM for 4431 with full BGP table? This message originates from outside of your organisation. Hi all, I am trying to figure out if a 4431 can accommodate a full BGP routing table with its default 4GB RAM or if it needs 8GB. Our current benchmark is a 2921 router with 2.5GB RAM: Cisco CISCO2921/K9 (revision 1.0) with 2506752K/114688K bytes of memory With a full routing table, it is only using about 839MB of RAM: ROUTER#sh mem HeadTotal(b) Used(b) Free(b) Lowest(b) Largest(b) Processor 3D52CDE0 2350969276 839257740 1511711536 1237731724 643241260 I/O900 117440512183827129905780098987952 98649340 (By the way, I would not recommend running a 2921 with a full BGP routing table since the CPU starts to buckle when throughput also approaches 100M, in my experience). By default, the 4431 comes with 2 GB for the data-plane and 4 GB for the control-plane. I would think this would be sufficient for a full BGP table, but the opinions I've seen out there appear to be conflicting. For example: https://supportforums.cisco.com/t5/wan-routing-and-switching/maximum-bgp-tab le-size-in-isr-4551-4331-with-standard-data-plane/td-p/2816329 Cisco itself states (https://www.cisco.com/c/en/us/products/collateral/routers/4000-series-integ rated-services-routers-isr/white-paper-c11-734550.html#_Toc424889858) that "All Cisco 4000 platforms support a full Internet routing table (500,000 prefixes) @ 8-GB DRAM." It's sounding to me like 8GB would be advisable. Wondering if anyone out there has real-world experience to share. BTW, in our case, we have limited ACLs and no NAT, but do have about 80 QoS policies also consuming resources (though I think that would impact CPU more than RAM). Thanks, Adam ___ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ ___ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
[c-nsp] RAM for 4431 with full BGP table?
Hi all, I am trying to figure out if a 4431 can accommodate a full BGP routing table with its default 4GB RAM or if it needs 8GB. Our current benchmark is a 2921 router with 2.5GB RAM: Cisco CISCO2921/K9 (revision 1.0) with 2506752K/114688K bytes of memory With a full routing table, it is only using about 839MB of RAM: ROUTER#sh mem HeadTotal(b) Used(b) Free(b) Lowest(b) Largest(b) Processor 3D52CDE0 2350969276 839257740 1511711536 1237731724 643241260 I/O900 117440512183827129905780098987952 98649340 (By the way, I would not recommend running a 2921 with a full BGP routing table since the CPU starts to buckle when throughput also approaches 100M, in my experience). By default, the 4431 comes with 2 GB for the data-plane and 4 GB for the control-plane. I would think this would be sufficient for a full BGP table, but the opinions I've seen out there appear to be conflicting. For example: https://supportforums.cisco.com/t5/wan-routing-and-switching/maximum-bgp-tab le-size-in-isr-4551-4331-with-standard-data-plane/td-p/2816329 Cisco itself states (https://www.cisco.com/c/en/us/products/collateral/routers/4000-series-integ rated-services-routers-isr/white-paper-c11-734550.html#_Toc424889858) that "All Cisco 4000 platforms support a full Internet routing table (500,000 prefixes) @ 8-GB DRAM." It's sounding to me like 8GB would be advisable. Wondering if anyone out there has real-world experience to share. BTW, in our case, we have limited ACLs and no NAT, but do have about 80 QoS policies also consuming resources (though I think that would impact CPU more than RAM). Thanks, Adam ___ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
