Question on Cisco 891 router 10/100 BASE-T Fast Ethernet WAN port used to connect speeds 150 download and 150 upload

[zerocool12]

To anyone I have a Cisco Router and the 10/100 BASE-T Fast Ethernet WAN port is currently connected to ethernet cable down to the ISP raiser closet. The current speed is 100 download and 100 upload. 

If I increase the bandwidth speed from our ISP to 150 down and 150 upload will I still be able to use the 10/100 Base-T Fast Ethernet WAN port to get the benifit of the speed increase or do I need to use the 1000 BASE-T Gigabit Ethernet WAN port instead. 
I have a ethernet cable coming out of the one of the ports 10/100 Fast Ethernet on the Cisco 891 router connected to the a 48 port 10/100 switch.

which I have laptops connected to the 48 port switch. Will there be any issues of laptops connected to the 48 port switch to benifit from the speed increase.

Thank you

[vivek srivastava]

You will never get 150 down and 150 up over a 10/100 BASE-T.

If your ISP does "speed auto" then your interface will be up, but will operate only 100 down and 100 up maximum.

[zerocool12]

I see so even if I switch over to use the Gigabit WAN port, but since my switch is a 48 port 10/100 and its connected to the 10/100 port on the Cisco Router it won't get the 150 down and up.

So unless the switch is a gigabit switch and the extra ports on the router are gigbit ports then it should work.

[vivek srivastava]

If you want to utilise 150Mbps of speed then you should have Gig ports at router as well as in-between the connetivity of router and switch. This means on switch at least 1 gig port is required which will connect to router's gig port and router also should have at least 2 gig ports, one for WAN and other for switch connectivity. Then only switch will be able to pass traffic of more than 100Mbps to-and-from the router.

[zerocool12]

thanks Vivek for the info.

Make sense now.

[Joseph W. Doherty]

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Posting

As Vivek has already noted, you'll never get 150 Mbps on a (single) 100 Mbps link.  However, I also wanted to mention, an 891 isn't really suitable to 100 Mbps.  (NB: Cisco recommends the 89x for up to 15 Mbps.)

Cisco routers often don't have the capacity to run their ports as the full bandwidth, sustained.  I.e. just don't buy a router with gig ports and assume it can handle gig throughput, or even 150 Mbps.

[rosaho]

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