where < name > is a string of up to 63 alphanumeric characters and hyphens. For example: cmc-1, d-345.NOTE: If a DNS Domain name is not specified then the maximum number of characters is 63. If a domain name isspecified then the number of characters in CMC name plus the number of characters in the DNS Domain Name mustbe less than or equal to 63 characters.• DNS Domain Name — The default DNS domain name is a single blank character. To set a DNS domain name, type:racadm config -g cfgLanNetworking -ocfgDNSDomainName where < name > is a string of up to 254 alphanumeric characters and hyphens. For example: p45, a-tz-1, r-id-001.Configuring auto negotiation, duplex mode, and network speed (IPv4and IPv6)When enabled, the auto negotiation feature determines whether the CMC automatically sets the duplex mode and network speedby communicating with the nearest router or switch. By default, auto negotiation feature is enabled.You can disable auto negotiation and specify the duplex mode and network speed by typing:racadm config -g cfgNetTuning -o cfgNetTuningNicAutoneg 0racadm config -g cfgNetTuning -o cfgNetTuningNicFullDuplex <duplex mode>where:< duplex mode > is 0 (half duplex) or 1 (full duplex, default)racadm config -g cfgNetTuning -o cfgNetTuningNicSpeed <speed>where:< speed > is 10 or 100 (default).Configuring Management Port 2The second network port on the CMC can be used for daisy-chaining CMCs together for cable reduction, or as a redundant port forfailover networking operation. Management Port 2 may be connected to the top-of-rack (TOR) switch or to another switch. Thereis no requirement that the two CMC NIC ports be connected to the same subnet.The CMC cannot be cabled for Management Network Port redundancy prior to actually configuring it for this operation. The CMCmust use the standard single network connection for deployment, after which the second redundant connection may be made.NOTE: When Management Port 2 is set for Redundant but is cabled for Stacking, the downstream CMCs (further fromthe TOR switch) will not have a network link.NOTE: When Management Port 2 is set for Stacking but is cabled for Redundant (two connections to the TOR switch),routing loops could cause a network storm.To specify Redundant operation, use racadm config –g cfgNetTuning –o cfgNetTuningNicRedundant 1command.To specify Stacking operation, use racadm config –g cfgNetTuning –o cfgNetTuningNicRedundant 0 command.By default, the Management Port 2 is set for Stacking.Configuring Management Port 2 using CMC web interfaceTo configure Management Port using CMC Web Interface:1. In the left pane, click Chassis Overview → Network, and then click the Network tab.2. On the Network Configuration page, in the General Settings section, next to Management Port 2, select either Redundantor Stacking.3. Click Apply Changes.• When Management Port 2 is set for Redundant but is cabled for Stacking, the downstream CMCs (further from the top-of-rack switch) does not have a network link.59
