Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Attention: The Community will be in read-only mode on 12/14/2017 from 12:00 am pacific to 11:30 am.

During this time you will only be able to see content. Other interactions such as posting, replying to questions, or marking content as helpful will be disabled for few hours.

We apologize for the inconvenience while we perform important updates to the Community.

Silver

Nexus 5548- Hardware Portchannel Resources

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?

Siddhartha
4 REPLIES
VIP Super Bronze

Nexus 5548- Hardware Portchannel Resources

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

http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/configuration_limits/limits_503/nexus_5000_config_limits_503_n1_1b.html#wp327738

HTH

Silver

Nexus 5548- Hardware Portchannel Resources

thanks for the link but I already checked it, I don't see any details about hardware portchannel resources and which scenarios consume them.

Siddhartha
VIP Super Bronze

Nexus 5548- Hardware Portchannel Resources

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.

http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9670/C07-572829-01_Design_N5K_N2K_vPC_DG.pdf

HTH

Silver

Re: Nexus 5548- Hardware Portchannel Resources

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 )

Siddhartha
611
Views
0
Helpful
4
Replies
CreatePlease to create content