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H3 BGP advertisement

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#1 jordankn


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Posted 15 March 2019 - 04:27 AM

Hi all,
I need confirmation about one additional command needed for the requirement about "ensure that the aggregate prefix is always advertised as soon as their eBGP sessions come up ... "
bgp aggregate-timer 0
neighbor x.x.x.x advertisement-interval 0

Anyone config this in real lab and pass it?

#2 jordankn


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Posted 15 March 2019 - 06:46 AM

Another question which pop up about OSPF configuration. There was a requirement to speed up ospf convergence.
So you can configure OSPF incremental SFP algorithm with "ispf" command.

Benefits of OSPF Incremental SPF
OSPF uses Dijkstra's SPF algorithm to compute the shortest path tree (SPT). During the computation of the SPT, the shortest path to each node is discovered. The topology tree is used to populate the routing table with routes to IP networks. When changes to a Type-1 or Type-2 link-state advertisement (LSA) occur in an area, the entire SPT is recomputed. In many cases, the entire SPT need not be recomputed because most of the tree remains unchanged. Incremental SPF allows the system to recompute only the affected part of the tree. Recomputing only a portion of the tree rather than the entire tree results in faster OSPF convergence and saves CPU resources. Note that if the change to a Type-1 or Type-2 LSA occurs in the calculating router itself, then the full SPT is performed.

What do you think?

#3 johnspain


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Posted 17 March 2019 - 09:23 AM

as per the feedbacks who passed H3, the solution is as example:
router bgp 65001
bgp router xxxx
bgp aggregate-time 0
net mas (<-- loopback0 IP)
agg summary-only

follow the same in the other routers.

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