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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

PDF

Standard VLAN MIB

When the Aggregator is in Standalone mode, where all the 4000 VLANs are part of all server side interfaces as well as the single uplink LAG, it takes a long time (30 seconds or more) for external management entities to discover the entire VLAN membership table of all the ports. Support for current status OID in the standard VLAN MIB is expected to simplify and speed up this process. This OID provides 4000 VLAN entries with port membership bit map for each VLAN and reduces the scan for (4000 X Number of ports) to 4000.

Enhancements

  1. The dot1qVlanCurrentEgressPorts MIB attribute has been enhanced to support logical LAG interfaces.
  2. Current status OID in standard VLAN MIB is accessible over SNMP.
  3. The bitmap supports 42 bytes for physical ports and 16 bytes for the LAG interfaces (up to a maximum of 128 LAG interfaces).
  4. A 59 byte buffer bitmap is supported and in that bitmap:
    • First 42 bytes represent the physical ports.
    • Next 16 bytes represent logical ports 1-128.
    • An additional 1 byte is reserved for future.

Fetching the Switchport Configuration and the Logical Interface Configuration

Important Points to Remember

  • The SNMP should be configured in the chassis and the chassis management interface should be up with the IP address.
  • If a port is configured in a VLAN, the respective bit for that port will be set to 1 in the specific VLAN.
  • In the aggregator, all the server ports and uplink LAG 128 will be in switchport. Hence, the respective bits are set to 1.
The following output is for the default VLAN.

Example of dot1qVlanCurrentUntaggedPorts output 

snmpwalk -Os -c public -v 1 10.16.151.151 1.3.6.1.2.1.17.7.1.4.2.1.5
                                    mib-2.17.7.1.4.2.1.5.0.1107525633 = Hex-STRING: 
                                    FF FF FF FF 00 00 00 00 00 00 00 00 00 00 00 00 
                                    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
                                    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
                                    00 00 00 00 00 00 00 00 00 
                                    01 00

The last byte is free byte . The bit for LAGs starts from 43 byte. If server LAG 1 is created with server ports Te 0/6 and Te 0/7, the respective bit for the ports are unset and the bit for LAG 1 is set in default VLAN. The corresponding output will be as follows: 

snmpwalk -Os -c public -v 1 10.16.151.151 1.3.6.1.2.1.17.7.1.4.2.1.5
                                    mib-2.17.7.1.4.2.1.5.0.1107525633 = Hex-STRING: 
                                    F9 FF FF FF 00 00 00 00 00 00 00 00 00 00 00 00 
                                    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
                                    00 00 00 00 00 00 00 00 00 00 
                                    80 00 00 00 00 00 
                                    00 00 00 00 00 00 00 00 00 
                                    01 00

In the above example, the 43rd byte is set to 80. The 43rd byte is for LAG IDs from 1 to 8. But, only one LAG po 1 is set as switch port. Hence, the binary bits will be 10000000. If this converted to Hexadecimal, the value will be 80. Similarly, the first byte for Te 0/1 to Te 0/8 server ports, as the 6th and 7th byte are removed from switch port, the respective bits are set to 0. In binary, the value is 11111001 and the corresponding hex decimal value is F9.

In standalone mode, there are 4000 VLANs, by default. The SNMP output will display for all 4000 VLANs. To view a particular VLAN, issue the snmp query with VLAN interface ID. 

Dell#show interface vlan 1010 | grep “Interface index”
                                    Interface index is 
                                    1107526642
Use the output of the above command in the snmp query. 
snmpwalk -Os -c public -v 1 10.16.151.151 1.3.6.1.2.1.17.7.1.4.2.1.4.0.
                                    1107526642
                                    mib-2.17.7.1.4.2.1.4.0.1107526642 = Hex-STRING: 
                                    F9 FF FF FF 00 00 00 00 00 00 00 00 00 00 00 00
                                    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                    00 00 00 00 00 00 00 00 00 00 
                                    80 00 00 00 00 00
                                    00 00 00 00 00 00 00 00 00 
                                    01 00

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