In our environment we have a 7609 router with RSP720-3CXL and several 76-ES+XT-2TG3CXL, all components are operating at 3CXL mode ( XL - is requirement because equipment holds full internet table). Now we have a need to add STM-1 interfaces to that box. As far as understood there is two ways to deploy STM-1 interfaces there:
1. SIP with SPAs
2. Enhanced FlexWan module with port adapters.
My main concern is 3CXL operation of a system. As far as I know whole system will work in the mode of lowest installed DFC type. So if I install SIP-600 (which is 3BXL) all my modules with DFCs will work in 3BXL mode. Sounds bad. Another problem is that I cannot find any information on what it will change. Couldn't find any information on differences between 3BXL and 3CXL. Somewhere I found that 3BXL has lower TCAM table 64k, 3xcl has 96k, but this is not a big concern to me.
As for FlexWan I couldn't even find in which mode this module works, somewhere I found that it is CEF256 module. But on other side It has its own memory and processors, so it's somehow taking part in distributed forwarding.
So my questions are:
1. What impact besides TCAM size it will have if I move from 3CXL to 3BXL?
2. Will Enhanced FlexWan module somehow affect operation of 76-ES+XT-2TG3CXL modules?
Does anyone have any idea on it?
Thanks in advance!
>> I understand that Enhanced Flexwan doesn't have DFC onboard, but it has its own processor and memory, may be this could also affect DFC operation mode.
I don't think so because the flexwan does not have a link to the fabric, so it cannot be the cause of a downgrade
for this reason in your case the use of the flexwan might be a better choice even if a SIP linecard is more powerful
I would consider a SIP-400 instead of a SIP-600 for the same reason
I have a system similar (aligned with DFC 3BXL) with a SIP-400 installed this does not create problems to linecards with DFC
sh platform hard pfc mode
PFC operating mode : PFC3BXL
sh platform hard capacity
PFC operating mode: PFC3BXL
Supervisor redundancy mode: administratively sso, operationally sso
Switching resources: Module Part number Series CEF mode
1 WS-X6724-SFP CEF720 dCEF
2 WS-X6748-GE-TX CEF720 dCEF
3 7600-SIP-400 CEF256 CEF
4 WS-X6708-10GE CEF720 dCEF
6 WS-SUP720-3BXL supervisor CEF
in this case PFC mode is 3BXL, WS-6708 has a DFC 3 CXL on it but it works in DFC 3BXL mode. the SIP-400 does not create any problem to the other linecards
see C6500 architecture
enhanced flexwan performance data
I would point to SIP-400 for your needs, as SIP-600 may cause a little downgrade to 3BXL mode
Hope to help