We are thinking about adding another full T1 line to our existing ISP so we will have redundancy and higher bandwidth. I realize I don't get true redundancy by having both T1 lines to the same ISP. We thought about buying an IP block/ASN and have two different ISPs route traffic, but it is way too expensive. So we opted to get another T1 line from the existing ISP and to provide higher bandwidth and WAN failover redundancy. I am also looking for hardware failover.
I would really appreciate if someone can advise.
We currently have cisco 2620 router with the WIC-1DSU-T1 and Fe 0/0 (onboard) modules. Existing T1 line feeds into this router. The Fe0/0 connects to our firewall. Here is the spec for the router in production.
IOS (tm) C2600 Software (C2600-I-M), Version 12.0(7)T, RELEASE SOFTWARE (fc2)
cisco 2620 (MPC860) processor (revision 0x102) with 26624K/6144K bytes of memory.
Processor board ID JAD04390KWU (1814404175)
M860 processor: part number 0, mask 49
X.25 software, Version 3.0.0.
1 FastEthernet/IEEE 802.3 interface(s)
1 Serial network interface(s)
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read/Write)
We also recently bought another Cisco router for some other purposes, but that project didn't take off and the router is collecting dust. It's 2651XM AIM-VPN/BPII-PLUS with two slots and no WIC module. It has two onboard FastEthernet Ports with 256MB of RAM.
I am thinking of using both 2620 and 2651XM for hardware failover. The 2651XM will be the primary and 2620 is secondary. Both should be able to aggregate the two T1 lines for higher bandwidth. What's the best way to feed two T1 lines into these two routers for WAN failover redundancy, hardware failover and link aggregation? Do they support BGP?
Given the budget, I thought I will stay with 2600 series routers and buy WIC modules. I think 2600 series is discontinued. Should I go for 2800 series?
Your advice is greatly appreciated. You can also point me to whitepapers, etc.