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Re: IS-IS on FRR - Is Anyone Running It?
From: Saku Ytti <saku () ytti fi>
Date: Mon, 6 Apr 2020 12:25:43 +0300
On Mon, 6 Apr 2020 at 12:13, Mark Tinka <mark.tinka () seacom mu> wrote:
Ummh, not really. As mentioned, we run 9,178 bytes on IOS and IOS XE, and 9,192 bytes on Junos and IOS XR, in our network.
Quite and then you specified but for ISIS you run 8000. I'm only talking about your ISIS here, not rest. And that 8k doesn't do anything useful, so you can run 1500B to your FRR and not lose anything.
The 8,000 bytes we run is done only on the IOS, IOS XE and CSR1000v boxes. It doesn't mean that we are trying to transport IS-IS PDU's at 8,000 bytes. It just means we can, and are capping it to just about what VMware ESXi can support.
As I explained this is not true, by standard ISIS cannot do this for
1500B MTU. As ISIS is 802.3 and 802.3 cannot send larger frames.
Cisco has proprietary hack to do EthernetII for hellos, but even that doesn't guarantee anything, because ISIS will still come up, even if it receives subMTU hello as 802.3. -- ++ytti
Current thread:
- Re: IS-IS on FRR - Is Anyone Running It?, (continued)
- Re: IS-IS on FRR - Is Anyone Running It? John St.Martin (Apr 06)
- Re: IS-IS on FRR - Is Anyone Running It? Mark Tinka (Apr 05)
- Re: IS-IS on FRR - Is Anyone Running It? Randy Bush (Apr 05)
- Re: IS-IS on FRR - Is Anyone Running It? Mark Tinka (Apr 06)
- Re: IS-IS on FRR - Is Anyone Running It? Saku Ytti (Apr 05)
- Re: IS-IS on FRR - Is Anyone Running It? Anoop Ghanwani (Apr 06)
- Re: IS-IS on FRR - Is Anyone Running It? Saku Ytti (Apr 06)
- Re: IS-IS on FRR - Is Anyone Running It? Radu-Adrian Feurdean (Apr 06)
- Re: IS-IS on FRR - Is Anyone Running It? Saku Ytti (Apr 06)
- Re: IS-IS on FRR - Is Anyone Running It? Mark Tinka (Apr 06)
- Re: IS-IS on FRR - Is Anyone Running It? Saku Ytti (Apr 06)
- Re: IS-IS on FRR - Is Anyone Running It? Mark Tinka (Apr 06)
- Re: IS-IS on FRR - Is Anyone Running It? Mark Tinka (Apr 06)
- Re: IS-IS on FRR - Is Anyone Running It? Radu-Adrian Feurdean (Apr 06)
- Re: IS-IS on FRR - Is Anyone Running It? Mark Tinka (Apr 06)
- Re: IS-IS on FRR - Is Anyone Running It? Mark Tinka (Apr 06)
- Re: IS-IS on FRR - Is Anyone Running It? Saku Ytti (Apr 06)
- Re: IS-IS on FRR - Is Anyone Running It? Mark Tinka (Apr 06)
- Re: IS-IS on FRR - Is Anyone Running It? Saku Ytti (Apr 06)
- Re: IS-IS on FRR - Is Anyone Running It? Mark Tinka (Apr 06)
- Re: IS-IS on FRR - Is Anyone Running It? Saku Ytti (Apr 06)