topic Re: IOS XR connectivity in DevNet Sandbox

IOS XR connectivity

mulhollandm — Mon, 17 Jan 2022 17:20:37 GMT

folks

i've setup my own topology with three ios xr routers in a standard topology with all three connected in a full mesh

i have configured a lan on each routers gi0/0/0/30 interface with the router as .1 and an alpine host as .254

my issue is

the alpine host can't get a ping reply from its gateway and the routers can't ping each other over their directly connected links

i can see arp requests but no replies

i have a l2 switch between the router and alpine and if i put avlan ip on it, the host can ping the switch but the switch gets no response from the router

anyone see this before, ios xr is new to me so maybe i'm missing something?

i've attached the yml file but had to save it as txt so i can upload it

thanks to anyone taking the time to look or reply

Re: IOS XR connectivity

balaji.bandi — Mon, 17 Jan 2022 17:15:14 GMT

is this reasl or emulators/siumulators ?

we do not have any visibility what is configured ? is this VRF ? post topology and configuration to look :

or start with below :

https://networkgeekstuff.com/networking/cisco-ios-xr-complete-getting-started-examples-guide/

Re: IOS XR connectivity

mulhollandm — Mon, 17 Jan 2022 17:23:48 GMT

apologies folks, i thought i had attached the lab fiile but have done now

just noticed i can't run a packet capture on the links as devnet cml says i need to start the link even though the interfaces are up but when starting the link i get the error below

Starting link failed: The API at /api/v0/labs/dbf3fc/links/l1/state/start encountered an unexpected error. Please report this problem to support.

Re: IOS XR connectivity

Harold Ritter — Mon, 17 Jan 2022 17:53:35 GMT

Hi @mulhollandm ,

I do not see any IGP configured in your yaml file. You will need to configure an IGP to provide connectivity between the different LANs. Make sure you configure a default GW on the Alpine workstations as well.

Regards,

Re: IOS XR connectivity

Harold Ritter — Mon, 17 Jan 2022 19:00:14 GMT

Hi @mulhollandm ,

I would start by reducing the number of interfaces for each XRv router. You do not need that many interfaces for the topology you are running and having a high number of interfaces might be causing the issue you are seeing.

Regards,

Re: IOS XR connectivity

mulhollandm — Mon, 17 Jan 2022 21:49:21 GMT

harold

many thanks for your reply, its greatly appreciated
do i need to build the topology from the start or can i remove the number of interfaces in an existing lab i have

i'm running this in my own cml personal plus so would like to try and re-use that if possible
thanks again

Re: IOS XR connectivity

Harold Ritter — Mon, 17 Jan 2022 22:12:41 GMT

Hi @mulhollandm ,

You need to stop and wipe the router to be able to remove the extra interfaces. You do not need to build from scratch. Make sure you save your configuration (Nodes-> Extract Configs) before you stop the router. Delete the extra interfaces and then restart the router.

Regards,

Re: IOS XR connectivity

mulhollandm — Tue, 18 Jan 2022 01:13:59 GMT

harold

trying this in my own cml lab and so far it's working fine now i've reduced the no of interfaces

thanks for your help, it's greatly appreciated