I had a small clarification regarding the inbound outbound usage of offset-lists since I've been reading contradicting things regarding it.
So say we have a simple topology.
Both R1 and R2 are running RIPv2 with no auto-summary and R1 has 2 loopback interfaces configured. Now, when we go to R2, by default, the metric to reach the loopbacks of R1 will be 1.
Now say we apply the following offset list on R2
offset-list 1 in 3 access-list 1 permit 220.127.116.11 0.0.0.255
Now if I'm right, the metric seen on R2 will be 4. Since we set an inbound metric as 3 and +1 because R1 sent his update with a hopcount of 1. That's fine.
Now for example, say I remove the access-list and offset list on R2 and add the following on R1's RIP process.
offset-list 2 out 4 access-list 2 permit 18.104.22.168 0.0.0.255
So now, my doubt is, will R2 receive the update with a metric of 4 or will it receive it with a metric of 5?
The reason I ask is because I've learnt that when you apply an offset-list as outbound, it sends the metric as it is configured while when you set it as inbound, it adds the received metric to the offset-list value. Also if we follow the logic that routers increment hop count and then send the update out rather than increment it on receiving an update, this should be correct. But on GNS3 and in a few other places, it says that R2 will receive the update with hop count 5 when by my understanding, it should be 4. Is this a bug in GNS3 or is it how it really works?
I'm practicing everything with regard to Cisco 3700 series routers 12.4 IOS version.
Any help would be much appreciated!