We have one point to point link of 10MBPS. when ever there is an outage with the ISP with the fiber outage, line protocol of the physical interface is not going down. it will be up always, because of its state up, traffic will not switch over to secondary. we have to manually make the primary interface shut to divert the trafiic. we have terminated the lines to Fastethernet interfaces.
Could you kindly suggest what could be the problem.
Its not unheard of in certain types of optical implementations.
For example, In the past we had Fast E terminations from the carrier on Cisco ONS devices. the fast e components were
actually switches. even with a ring cut, the switch side facing our hardware stayed up/up. Our only means at the time to detect a link outage was a neighbor loss log entry.Since we had redundant links, the clients never noticed.
It is interesting that you are using EIGRP as your dynamic routing protocol. As suggested by Joseph EIGRP is pretty good at detecting failure of the primary route and switching to a backup route. Is EIGRP running on this point to point link to the ISP?
how is the route to TATA defined to routing processes ?
As stated before, it is entirely possible for the physical link between your device and the next device to
stay UP, while the L3 protocol is down.
Assume for discussion a device that takes your ethernet handoff as ethernet, then maps that on to a sonet service (very common). If the Sonet service fails, there is no means to take the ethernet down between your device and the carriers
device. that link status is independent of whatever is on the carrier side. The two link states are independent of each other.
I agree with vmiller that we need more information. At first we were told that you use EIGRP. Then we are told that EIGRP is for internal and BGP, static routes to ISP. We could give you better answers if you provide more detail about the topology of the network and how things are configured.
Also vmiller makes a very good point that Ethernet interfaces frequently stay as line is up line protocol is up even when there is not layer 3 connectivity to the next hop. So if the route that you are asking about is a static route which goes out an Ethernet then his suggestion of using IP SLA is a very good suggestion and I agree with it.
So please give us some useful details about this route that is not working as you expect.
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
As Vmiller has noted, it's not unheard of on some physical topologies. Dynamic routing protocols should note the logical disconnection but if you're doing static routing, I believe, depending on platform, you could use IP SLA to logically detect the link outage too.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...