We are replacing a DS3 Internet connection with a 100 Mbps fastE connection from a Tier 1 Provider. I currently have a Cisco 7204VXR with 512 Mb DRAM and 128 Mb of Flash and two 10/100 ports that is connected to the DS3. I also have a 3845 with 1 Gb of DRAM and 256 Mb of Flash with two 10/100/1000 ports available.
We are currently running BGP, below is the summary
BGP table version is 88880414, main routing table version 88880414
379041 network entries using 44347797 bytes of memory
379043 path entries using 19710236 bytes of memory
63121/63114 BGP path/bestpath attribute entries using 7827004 bytes of memory
55854 BGP AS-PATH entries using 1469262 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
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100 Mbps Ethernet, to guarantee wire-rate, could require about 300 Kpps. A NPE400 is rated at 400 Kpps, the 3845 at 500 Kpps. You might, or might not (much depends on your router's configuration, actual traffic load and kinds of traffic), be able to connect the new 100 Mbps to either router.
If you're only going to have about the same traffic on the new link vs. the DS3, you might be just fine. If not, Paolo's suggestion is good, although you might also want to price compare to the latest ISRs.
I've attached a Cisco documents that describes performance for their various routers.
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