Unanswered Question
Oct 16th, 2007

Dear Sir,

If we want to replace the existing 6506(HSRP/OSPF) and 3660(OSPF and BGP) together. Can we get a 6506E to replace both of them in one go?


I have this problem too.
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ankbhasi Tue, 10/16/2007 - 19:51

Hi Joseph,

So you want to replace both with one 6506E or 2 6506E replacing 6506 and 3660?

All your 6506 line cards will fit in 6506E and ready to use but 3660 is a router which can be replaced with 6506E but you have to get sup engines and line cards for this and have to reconfigure all what you have configure on your 3660 router on 6506E switch.

Do arrange good amount of downtime before moving ahead with your plans.



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josephschung Tue, 10/16/2007 - 20:14

Hi Ankur,

Actually, the existing environment is:

1. 2 x 6506

2. 2 x 3660

Or 2 x (6506+3660)

Now they want to replace 1 x 6506 and 1 x 3660. I am planing to get a new 6506E with routing module so that the network becomes:

1. 1 x 6506 (old)

2. 1 x 3660 (old)

3. 1 x 6506E (new)

The 6506 and 6506E will be a pair of core switch.

Do you think the plan is good?


ankbhasi Tue, 10/16/2007 - 21:01

Hi Joseph,

It all depends what you were running earlier and what are you planning now. As per your current scenario after replacement you will be having 3 network devices in your network which includes 2 6k boxes and only 1 3660 router.

Before replacement you are having 4 network devices 2 6k box and 2 3660 router which means you are eliminating 1 3660 alltogether so it depends for what purpose you were using 3660 which you are replacing.

You can have 6506 and 6506E as pair of core switch with redundancy and load sharing with routing protocols configured but then for what purpose you were using pair of 3660 router. So may be we need to understand more on what role your 3660 routers were playing and what exactly you need now in your network.



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josephschung Tue, 10/16/2007 - 22:21

Hi Ankur,

The 3660 is for remote site connection with following spec:


cisco 3660 (R527x) processor (revision 1.0) with 121856K/9216K bytes of memory.

Processor board ID JMX0712L2H1

R527x CPU at 225MHz, Implementation 40, Rev 10.0, 2048KB L2 Cache

Bridging software.

X.25 software, Version 3.0.0.

SuperLAT software (copyright 1990 by Meridian Technology Corp).

TN3270 Emulation software.

3660 Chassis type: ENTERPRISE

3 FastEthernet/IEEE 802.3 interface(s)

1 Virtual Private Network (VPN) Module(s)

DRAM configuration is 64 bits wide with parity disabled.

125K bytes of non-volatile configuration memory.

32768K bytes of processor board System flash (Read/Write)


It is for remote site connection though VPN.


ankbhasi Tue, 10/16/2007 - 22:25

Hi Joseph,

So you want to say you are currently having 3660 so that remot site can vpn to this box correcr? So as you said you had 2 3660 boxes where you using the second one as backup?



josephschung Tue, 10/16/2007 - 23:10

Hi Ankur,

Both of 3662 are in production and building VPN tunnel with remote site.



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