One router with 3 ISPs - connection with FEs or VLANs

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May 12th, 2010
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Hi,


Having one 3 ISPs connecting to one router (3 WAN dedicated links on one site for redundancy) what would be the difference having those ISPs on 3 different FE ports on the router or to connect them to HWIC-4ESW and assign each port to a different VLAN?


Having each ISP on seperate VLAN would work for load-sharing or IPSec VPN site to site o DMVPN?


Thanks for any suggestions.

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paolo bevilacqua Wed, 05/12/2010 - 13:33
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Unless you need full FE bandwidth on any circuit, there is no difference, and not even if you brinng these ot a switch and use tagged subinterfaces-

remi-reszka Wed, 05/12/2010 - 13:49
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Thank you for reply but I don't quite get it. Does it mean I don't get 100Mbps on the each interface of the HWIC-4ESW? Please elaborate on that.

paolo bevilacqua Wed, 05/12/2010 - 13:57
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You don't, beside the router also will have limited performances anyway.


You need an end ISR G2 to handle multiple fastehrenet at wire speed,

remi-reszka Wed, 05/12/2010 - 14:05
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In fact that is what we are going for, either one 2901 with one HWIC-4ESW or 2911 with HWIC-2FE. Since the ISP dedicated links are 1, 2 o 4Mbps we don't need the full 100Mbps on each of the routers interfaces. 2901 with 4ESW will be the cheaper option but I would need to make sure if I can configure load-balancing, NAT/PAT , zone-based policy firewall or even redundant IPSec VPN on all the 3 VLANs.


Would that all be possible?


Thanks.

paolo bevilacqua Wed, 05/12/2010 - 14:33
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Yes. Keep in mind the best way to terminate circuit on a router is uning the native circuit interface, be that E1 or whatelse, and not any ethernet "converter", because that way you will be able monitor the true performance of the circuit, and apply QoS without complications.

remi-reszka Wed, 05/12/2010 - 14:37
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Well that's not the case because the dedicated links are terminated on ISPs routers and we don't have access to them. So, VLANs on the HWIC-4ESW or native FE interfaces? Thanks

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