Andrew,
Le 17/12/2019 à 06:57, Andrew Alston a écrit :
Alex,
Will try and get you some captures off the devices I’ve been testing on
– in order to make sure I understood this draft properly, and in light
of the deployment status draft, I decided to play a lot more deeply and
setup a bit of a lab. I’m still doing tests and soon as I have some
other bits completed will send through the packet captures from those
against (Since the XR boxes that I have to test on seem to have
absolutely no ability to setup traffic steering with SRv6 (and I
actually have requested details of how to configure this in the past but
gotten no response), I’m just finishing the code to inject packets from
outside with a sid stack to test this. I also acknowledge that I’m
running tests against code that is implementing a draft that seems far
from final – and so shouldn’t have that many expectations.
That being said, In light of the deployment draft – I do have some
concerns that there is a draft that specifies that people have put this
stuff into production – yet the implementation in current shipping code
seems to be **way** off the draft and contrary to things we have been
told in the working group.
Some of the more interesting finds so far:
* In Montreal – I questioned the growth in the IGP tables – since I
would have to use a separate locator on each router – I was
explicitly told this wasn’t necessary and could use the loopbacks –
not so in current code – use of the loopback marks the locator as down.
* Locator size is not configurable as anything other than a /64
* XR 7.0.1 claims a maximum number of SID’s at 8000 – I’m still
unclear if this limitation in the code is based on locally
configured SID’s or received SID’s – and will run some tests on this
in the coming day or two to verify
* There seems to be a limit on a single locator per box – I’m still
trying to figure out what impact this will have in a multi-area or
multi-level IGP deployment scenario.
* By default when configuring a locator – the device configures a
separate End.X (PSP) for each interface – now – this is where things
get interesting. If I am reading the NP text correctly, End.X (PSP)
should be locator:0006:: - However, in the shipping code, that is
not the case at all – as per the below:
/RP/0/RP0/CPU0:SRV6-R2#show segment-routing srv6 locator R2 sid Sun Dec
15 04:56:10.913 UTC/
/SID Behavior
Context Owner State RW/
/-------------------------- -----------
------------------------------ ------------------ ----- --/
/2001:db8:ee:2:1:: End (PSP)
'default':1 sidmgr InUse Y/
I would like to ask you whether that
2001:db8:ee:2:1::
could rather be
2001:db8:ee:ff:2:1::?
It is important for the 64 limit.
Alex
[...]
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