Confused on 7507 LAN routing throughput

jgardner150 · ‎05-23-2012

Hello Everyone,

I am currently working with a 7507 (RSP4). I have it set up as a router on a stick with on port with multiple VLAN's trunked to it and the only think it is doing is routing between VLANs. I am seeing some not so good performance resuts from this (gig interface only averages about 40% utilization at best). I started to dig into this and look for the performace secs of this router and I have gotten mixed opinions. I see some data sheets that say it's through put is only 176.64Mbps with CEF switching. I talk to other people and they tell me that it's connected on a gig interface so it should be able to fully utilize this. They say the 176.64Mbps is only WAN throughput.

So I guess I'm confused as to what speed this router should perform at when it is connected to a gig LAN connection for VLAN routing. Can someone please clear this up?

Thanks,

Sergey Fer · ‎05-23-2012

It is strongly depends on what GE module you use - is it VIP-based or may be old one? GEIP2+ as I remember is about 400 Mbps.

Giuseppe Larosa · ‎05-23-2012

Hello Jgarner,

C7507 is not able to perform line rate at GE speeds because it has a shared bus with 1Gbps speed shared among all linecards. Also there is no evident local switching capacity on VIP or GEIP+ modules. I mean there is no evident performance gain when routing between subinterfaces of the same GE port.

There are two 1GBps shared bus on C7513.

We used them some years ago on a mobile operator network and we had to move Vlans to C12000 for the low performance seen in lab tests on routing between subinterfaces.

With GEIP+ we could see roughly 300 Mbps with packets of big size.

It has been a very successful router with modularity and a lot of HW and features.

Hope to help

Giuseppe

Sergey Fer · ‎05-23-2012

GEIP is VIP2-50 based and it is 400 Mbps in maximum (http://www.cisco.com/en/US/partner/products/hw/modules/ps2643/products_white_paper09186a0080091db8.shtml).

GEIP+ is VIP4 based and it is up to 800 Mbps in theory (http://www.cisco.com/en/US/products/hw/modules/ps2033/products_data_sheet09186a0080091ce7.html).

VIP is it's own router (alike 7200) and it can implement forwarding locally.

jgardner150 · ‎05-23-2012

Here is a show hardware:

7507A#show hard

Cisco Internetwork Operating System Software

IOS (tm) RSP Software (RSP-JSV-M), Version 12.2(15)T12, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Compiled Thu 25-Mar-04 07:07 by cmong

Image text-base: 0x4001095C, data-base: 0x4204C000

ROM: System Bootstrap, Version 11.1(8)CA1, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

BOOTLDR: RSP Software (RSP-BOOT-M), Version 12.0(8)S, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

7507A uptime is 1 day, 13 hours, 41 minutes

System returned to ROM by reload at 11:45:48 UTC Sun May 20 2012

System image file is "slot0:rsp-jsv-mz.122-15.T12.bin"

cisco RSP4 (R5000) processor with 131072K/2072K bytes of memory.

R5000 CPU at 200Mhz, Implementation 35, Rev 2.1, 512KB L2 Cache

Last reset from power-on

G.703/E1 software, Version 1.0.

G.703/JT2 software, Version 1.0.

X.25 software, Version 3.0.0.

Bridging software.

TN3270 Emulation software.

Chassis Interface.

2 VIP2 controllers (8 Ethernet)(8 Serial)(4 T1)(4 Token Ring).

2 VIP4-80 RM7000 controllers (2 GigabitEthernet).

8 Ethernet/IEEE 802.3 interface(s)

2 Gigabit Ethernet/IEEE 802.3 interface(s)

4 Token Ring/IEEE 802.5 interface(s)

8 Serial network interface(s)

123K bytes of non-volatile configuration memory.

32768K bytes of Flash PCMCIA card at slot 0 (Sector size 128K).

8192K bytes of Flash internal SIMM (Sector size 256K).

No slave installed in slot 3.

Configuration register is 0x2102

Is it safe to say I should see around 800Mbps of LAN routing?

jgardner150 · ‎05-23-2012

Also I'm using one of the two Gig interfaces...

Giuseppe Larosa · ‎05-23-2012

Hello Sergey,

the question is that when dealing with routing on subinterfaces traffic counts "twice" or even "four times"

We performed performance tests with traffic generators (SMARTBITS in those times) so we did tests with bidirectional traffic with several different sizes ( from 46 IP size to 1500 IP size).

Practical results were like local switching was not effective, I should have written this

Edit:

Original poster Jgardener150:

from experience we cannot expect 800 Mbps per direction from a GEIP+ only 400 Mbps per direction or slightly less.

the marketing figure of 800 Mbps was half-duplex not full duplex

Best Regards

Giuseppe

Sergey Fer · ‎05-23-2012

Yes, I agree. 400 Mbps is much more real than 800 due to marketing features In any way this platform is not intended to be used in 1G.