ISIS route on routing table?

Hi Guys,

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I would like to ask if its normal to have routes being updated in RIB from ISIS network? Noticed that routes is almost an our for all route receive from isis while there's no service interruption on our network.

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We have multiple routers and noticed all of them has the similar output.

For example:

#sh ip route x.x.x.x

Routing entry for x.x.x.x

Known via "isis", distance 115, metric 30, type level-2

Redistributing via isis, bgp xxx

Last update from x.x.x.x on TenGigabitEthernet0/3/0, 01:32:02 ago

Routing Descriptor Blocks:

x.x.x.x, from x.x.x.x 01:32:02 ago, via TenGigabitEthernet0/3/0

Route metric is 30, traffic share count is 1

* x.x.x.x, from x.x.x.x, 01:32:02 ago, via TenGigabitEthernet1/3/0

Route metric is 30, traffic share count is 1

I don't see any interrupt on our network, same with our ISIS up time is months and weeks..also all routers has redundant link.

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Also routes under specific VRF doesn't change supposed the those route came from BGPvpnv4 as ISIS underlay.

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Thanks