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New Member

EIGRP_SIA questions??????

My Question is will re-convergance of EIGRP after route SIA cause any packet loss(or connection loss) for applications like telnet or FTP?


(1)My network is experiencing EIGRP SIA with neighbor resets( about every 35 to 45 minutes). The SIA are caused by the reconvergace of the routing process after various remote dial-up clients disconnect from the network.

(2) The individual interface don't show any packet drops,deferrals, or interface reset.

(3) CPU use and mem are normal below 10%during the day.

  • Other Network Infrastructure Subjects
New Member

Re: EIGRP_SIA questions??????

What is the SIA?




Re: EIGRP_SIA questions??????

This is a hard question to answer, not knowing your network. If EIGRP has a feasible succesor for the destination then that will be put into the routing table and little packet loss should occur. If there is no FS then once your route goes Active it will remain there, and unreachable for active-timer (default 3 minutes).

Eigrp SIA's are mostly caused by a couple of things. Since someone asked what SIA is let me explain briefly. When a route due to neighbor failure or other it goes in an Active state and it removed from the routing table. The router that looses this route sends queries to it's neighbors asking if they have a route for this destination. If all queries do not get returned from all routers that they were sent within the "active time" then the route is said to be "Stuck in Active". Once this timer expires the route should be purged from the routing table.

So, EIGRP query range size, summarization, and network stability can all effect SIAs.

Dialup links might do well with "passive-interface" on your EIGRP process to take these links out of this Query range and remove the effect of neighbor changes. If you can do static or OSPF demand circuit it might help your SIA problem.

For more information here is a link describing what an SIA is.

Hope this helps,


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