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Diffusing Update Algorithm (DUAL)
Cisco’s proprietary Enhanced Interior Gateway Routing Protocol (EIGRP) uses the Diffusing Update Algorithm (DUAL) to keep track of all adjacent neighbors’ advertised routes to find the best loop free...
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Spanning-Tree’s Root Bridge Election
The Spanning-Tree Protocol (STP) provides a loop free, layer-2 traffic path when two or more switches are connected to each other with redundant links. Election Process An election is held between...
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BGP – Conditional Route Advertisement
With the Border Gateway Routing Protocol (BGP), we can use conditions to control BGP route advertisement on a per-neighbor basis. These conditions are basic “IF, THEN” statements that can be broken...
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ISE – Exporting and Importing Certificates
If you are performing an application reset or re-imaging a Cisco’s Identity Service Engine (ISE) node that is a member of a multinode deployment, exporting your certificates before you begin will cut...
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ISE – Backups
Depending on the needs of your organization, backups can be performed as on-demand or scheduled ‘kron’ jobs. This can be accomplished with either the CLI or GUI of the primary admin node (or monitoring...
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ISE – Resetting Application and Database Configuration
If you find yourself in a position where you need to reset the application configuration and database of your Identity Services Engine node, here are a few suggestions for a little house cleaning...
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ISE – Resetting The Application Admin’s Password
Cisco’s Identify Service Engine (ISE) has a default password policy that locks out the admin (super admin) account after 45 days. E-mail alerts will be sent out to warn you 30 days before expiration,...
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BGP – Peer Groups
Peer groups are used with the Border Gateway Routing Protocol (BGP) to reduce processor load by cutting down on the footprint of BGP updates. Additionally, peer groups trim the fat from BGP...
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IP SLA – Scaling With Schedulers
If you have to maintain hundreds or thousands of IP SLAs to keep track of various network performance metrics, scheduling your IP SLA probes with a group schedule will save you time and effort when...
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BGP – Communities Attribute
The BGP community attribute is an optional transitive attribute; not all BGP speakers will understand community attributes, but they will pass these attributes on to those who will. A community can...
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