We use IPsec tunnels to connect to all the remote sites. We just upgraded our bandwidth from 512 K to full T1 of the remote sites. We did not change any bandwidth statement on the interfaces, but all the users are experiencing better performance. Does that bandwidth statement matter? Also from the netflow analyzier, it only shows 8k of the IPsec tunnel. I know it is T1 bandwidth now; should I change the bandwidth statement to full T1?
I think it is best practice to specify the bandwidth statement. Especially if you are using routing protocols, especially OSPF in particular. You are seeing 8k as your tunnel bw because this is the default for tunnel interfaces. Please note if the interfaces do not have any bandwidth statement what so ever, it will default to the interface default (serial=1.544 in USA). Below is output from a 3725
Gene asked if the bandwidth statement matters and about the bandwidth reported for his tunnel. Adam responded correctly that every interface has a default bandwidth and that for tunnels it is 9K. He also points indirectly to the use of bandwidth in the calculation of metric by OSPF and EIGRP. Narayn's response is more explicit about the use of bandwidth to calculate the metric in EIGRP and OSPF and he correctly points out that management software typically uses the interface bandwidth in calculating interface usage. And with in inaccurate bandwidth on the inteface the performance reporting will be inaccurate.
In addition I would point out that EIGRP by default will use no more than 50% of the interface bandwidth for sending of EIGRP protocol traffic. Using the default bandwidth on the tunnel interface could result in some problems for EIGRP (if EIGRP were running over the tunnel).
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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