03-31-2012 05:38 PM - edited 03-07-2019 05:53 AM
I am having hard time in understanding the hardware portchaeel resource conecpt in Nexus 5Ks. Can someone please explain which scenario is considered as a hardware portchannel and which is not. According to cisco documentation, 5548UP switch with layer 3 daughter card only supports 8 hardware portchannels, does this mean we can connect only 8 dual homed FEX to those 5Ks.Will a dual homed FEX consumes a hardware portchannel?
03-31-2012 08:16 PM
Have a look at this link. The first table provides the portchannel numbers for layer-2 and the second table for layer-2 and 3
HTH
03-31-2012 08:38 PM
thanks for the link but I already checked it, I don't see any details about hardware portchannel resources and which scenarios consume them.
03-31-2012 09:17 PM
Is this what you are looking for?
Cisco Nexus 5500 Platform
On the Cisco Nexus 5500 platform, each application-specific integrated circuit (ASIC) building block (referred to as unified port controllers) can index individual ports for unicast traffic, multiple ports for multicast traffic, and bundles of ports for PortChannels. The number of bundles that can be indexed on the Cisco Nexus 5500 platform is 48. If a PortChannel on a Cisco Nexus 5500 platform consists of two or more ports, the ports use one of these indexes. If a PortChannel consists of a single port (because, for instance, the other port is on the vPC peer device), the port does not consume any of the bundle indexes. Because of this behavior, a Cisco Nexus 5500 platform can be configured with as many PortChannels as the number of ports, whether these PortChannels consist of one, two, or more ports (Figure 7).
Figure 7. PortChannels on the Cisco Nexus 5500 Platform
For ports connecting to fabric extenders, this bundle index number is not relevant because fabric extenders ports are modeled to the Cisco Nexus 5500 platform as a single port: the hashing expansion happens on the fabric extender itself as described in a later section. As a result, a Cisco Nexus 5500 platform switch with a fabric extender can support as many PortChannels as the total number of ports.
HTH
03-31-2012 09:44 PM
Hi Reza,
I already read all those the documents about the Vpc but my questions still need to be answered
Vpc peer link and uplinks from the 5K to the core(back to back Vpc to 7K or 5500) will always consume a hardware portchannel
FEX/regular layer 2 switch dual homed to the 5Ks with one link each doesn't consume a hardware port channel
FEX/regular layer 2 switch dual homed to the 5ks with 2 links each cosumes a hardware port channel
are the above 3 statements true ( please correct if I am wrong )
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