Hi, How would you loadshare over many (>6) parallel E1 links. Currently we do it by connecting them directly to the Cisco's in each end, and do CEF based per-packet loadsharing, it works fine, but support a max of 6 E1's ... I've been thinking om something similar to the Larscom inverse MUX (http://www.larscom.com/t3ft3/t3_megae.htm), but this one only support 4 E1's, then I can use multiple i-mux's and loadshare over the 8M links they provide, but it seems like a poor solution. Yes, I do know that a E3 would be a far better choice, but our ADM (Add-Drop-Multiplexer??) at this specific location only support E1's :-( /Jesper -- Jesper Skriver (JS249-RIPE), Network manager Tele Danmark DataNet, IP section (AS3292) One Unix to rule them all, One Resolver to find them, One IP to bring them all and in the zone to bind them.
Jesper, You might consider MLP (multi-link PPP), with VIP2/50's. If you do go with an IMUX, I definitely recommend a HSSI to the routers, rather than Ethernet, unless the Ethernet is full-duplex. I've seen really poor performance due to collisions on the Ethernets at either end because the middle is actually 16Mbps full-duplex... Scott At 12:57 AM 9/18/98 , Jesper Skriver wrote:
Hi,
How would you loadshare over many (>6) parallel E1 links. Currently we do it by connecting them directly to the Cisco's in each end, and do CEF based per-packet loadsharing, it works fine, but support a max of 6 E1's ...
I've been thinking om something similar to the Larscom inverse MUX (http://www.larscom.com/t3ft3/t3_megae.htm), but this one only support 4 E1's, then I can use multiple i-mux's and loadshare over the 8M links they provide, but it seems like a poor solution.
Yes, I do know that a E3 would be a far better choice, but our ADM (Add-Drop-Multiplexer??) at this specific location only support E1's :-(
/Jesper
-- Jesper Skriver (JS249-RIPE), Network manager Tele Danmark DataNet, IP section (AS3292)
One Unix to rule them all, One Resolver to find them, One IP to bring them all and in the zone to bind them.
---- Scott Whyte |"Computers are different from telephones. Network Supported Accounts | Telephones ring. Computers do not ring." CCIE | -- Andrew S. Tanenbaum
This is a problem because igp issues: nnn-7202(config)#router ospf 1 nnn-7202(config-router)#maximum-paths ? <1-6> Number of paths Because of this, you are unable to hanle those multiple paths past 6. You also have the same isues with isis: nnn-7202(config)#router isis home1 nnn-7202(config-router)#maximum-paths ? <1-6> Number of paths I don't have a pdf viewer (on this machine), so can't cite this right now, but I think that the dl imux will handle up to 8 E1's: http://www.dl.com/online/datashts/dl3800e.pdf - jared On Fri, Sep 18, 1998 at 09:57:08AM +0200, Jesper Skriver wrote:
Hi,
How would you loadshare over many (>6) parallel E1 links. Currently we do it by connecting them directly to the Cisco's in each end, and do CEF based per-packet loadsharing, it works fine, but support a max of 6 E1's ...
I've been thinking om something similar to the Larscom inverse MUX (http://www.larscom.com/t3ft3/t3_megae.htm), but this one only support 4 E1's, then I can use multiple i-mux's and loadshare over the 8M links they provide, but it seems like a poor solution.
Yes, I do know that a E3 would be a far better choice, but our ADM (Add-Drop-Multiplexer??) at this specific location only support E1's :-(
/Jesper
-- Jesper Skriver (JS249-RIPE), Network manager Tele Danmark DataNet, IP section (AS3292)
One Unix to rule them all, One Resolver to find them, One IP to bring them all and in the zone to bind them.
-- Jared Mauch | pgp key available via finger from jared@puck.nether.net | http://puck.nether.net/~jared/
Jared Mauch wrote:
I don't have a pdf viewer (on this machine), so can't cite this right now, but I think that the dl imux will handle up to 8 E1's:
You might want to check into the 3com ab6200 as well. It's the only box we could find on the market that can imux more than 8 T1's (I assume it can do E1's as well). They say it should work up to 56 T1's, but you're out of HSSI bandwidth long before then of course. We're using it for 11 T1's imuxed right now and it seems to work fine. -- Brandon Ross Network Engineering 404-815-0770 800-719-4664 Director, Network Engineering, MindSpring Ent., Inc. info@mindspring.com ICQ: 2269442 Stop Smurf attacks! Configure your router interfaces to block directed broadcasts. See http://www.quadrunner.com/~chuegen/smurf.cgi for details.
In article <19980918095708.B10051@skriver.dk> you write:
How would you loadshare over many (>6) parallel E1 links. Currently we do it by connecting them directly to the Cisco's in each end, and do CEF based per-packet loadsharing, it works fine, but support a max of 6 E1's ...
Cisco has a nice white paper on this: http://www.cisco.com/warp/public/733/adap/multi/althb_wp.htm I think Multilink PPP may be your answer, as it goes up to 8 links. There is a CPU hit though, I've never tried Multilink on a high speed interface so I don't know how bad it might affect the router. -- Leo Bicknell - bicknell@dimension.net Network Engineer (CCIE #3440) - Dimension Enterprises 1-703-709-7500, fax, 1-703-709-7699
participants (5)
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Brandon Ross -
Jared Mauch -
Jesper Skriver -
Leo Bicknell -
Scott Whyte