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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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Setting the Overload Bit

Another use for the overload bit is to prevent other routers from using this router as an intermediate hop in their shortest path first (SPF) calculations. For example, if the IS-IS routing database is out of memory and cannot accept new LSPs, Dell EMC Networking OS sets the overload bit and IS-IS traffic continues to transit the system.

To set or remove the overload bit manually, use the following commands.
  • Set the overload bit in LSPs.
    ROUTER ISIS mode
    set-overload-bit
    This setting prevents other routers from using it as an intermediate hop in their shortest path first (SPF) calculations.
  • Remove the overload bit.
    ROUTER ISIS mode
    no set-overload-bit

Example of Viewing the Overload Bit Setting

When the bit is set, a 1 is placed in the OL column in the show isis database command output. The overload bit is set in both the Level-1 and Level-2 database because the IS type for the router is Level-1-2.
DellEMC#show isis database
IS-IS Level-1 Link State Database
LSPID           LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
B233.00-00     0x00000003   0x07BF       1074         0/0/0
eljefe.00-00 * 0x0000000A   0xF963       1196         0/0/1
eljefe.01-00 * 0x00000001   0x68DF       1108         0/0/0
eljefe.02-00 * 0x00000001   0x2E7F       1099         0/0/0
Force10.00-00  0x00000002   0xD1A7       1088         0/0/0
IS-IS Level-2 Link State Database
LSPID           LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL
B233.00-00     0x00000006   0xC38A       1110         0/0/0
eljefe.00-00 * 0x0000000E   0x53BF       1196         0/0/1
eljefe.01-00 * 0x00000001   0x68DF       1108         0/0/0
eljefe.02-00 * 0x00000001   0x2E7F       1099         0/0/0
Force10.00-00  0x00000004   0xCDA9       1093         0/0/0
DellEMC#

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