IS-IS - IS-IS Operation over Different Network Types - IS-IS Operation over Broadcast Links
9 important questions on IS-IS - IS-IS Operation over Different Network Types - IS-IS Operation over Broadcast Links
What are the selection criteria for a DIS?
-In case of tie; Router with highest SNPA (Sub network Point of Attachment)
-In case SNPAs are not comparable (frame relay/ATM) Router with highest system ID.
What is the command to configure the DIS priority?
What are the priority values ?
What priority value is better?
priority priority [level] 0 127
higher is better
What is the DIS responsible for?
-Representing the broadcast segment in the link-state database as a standalone object; the Pseudonode
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What are the possibilities when a router recieves a CSNP packet from a DIS? 3
-Router does not have an LSP with the indicated LSPID in its link-state database or sequence number on DIS is higher
-Router has an LSP with the same LSPID in its link-state database but its sequence number on the DIS is lower or the DIS not advertise this LSPID.
What is the action when a Router does not have an LSP with the indicated LSPID in its link-state database or sequence number on DIS is higher?
What is the action when the PSNP or LSP get lost during transmission?
Who is responsible to orginate and flood the Pseudonode LSP on a broadcast network?
What will happen when the DIS fails? 4
-No additional adjacency necessary ( all routers are fully adjacent)
-Pseudonode LSP will be replaced by the new elected DIS
-Routers will update their LSPs to point toward the new Pseudonode LSP
What is the difference between a network LSP or a router LSP?
-Router LSP , the System-ID carries the ID of the router and the Pseudonode is set to 0
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