Gyan,
On 03/10/2020 02:14, Gyan Mishra wrote:
Hi Jeff
From a domain perspective where you have a group of nodes and
associated IP addressed and SID are part of a discrete underlay instance
flex algo topology. On those same set of nodes you could have another
topology and associated address and SIDs for a different flex algo.
above is right.
How
this would work is that the topologies would have to be segregated from
each other as different MT instances or routing process instances. Is
that correct?
no MT at all. You can think of each flex-algo as a set of constraints
that is used to calculate the path over the common topology. You can
have many such felx-algos running on a common topology.
Can two nodes that run two different flex algo become ospf or isis
neighbors?
absolutely.
Peter
Kind Regards
Gyan
On Fri, Oct 2, 2020 at 6:25 PM Jeff Tantsura <jefftant.i...@gmail.com
<mailto:jefftant.i...@gmail.com>> wrote:
Hi Yingzhen,
Yes, that’s the case. The most important property of an algo
computed path is that is has to be consecutive, as either SID or IP
address associated with a particular topology is only known within
that topology.
Looking specifically at Ron’s draft (MPLS could be more complex due
to potential hierarchy) - the prefix itself defines the
context(topology) and must be globally unique, since IPv4 header
can’t have any additional meta-data attached.
Cheers,
Jeff
On Oct 2, 2020, 1:15 PM -0700, Yingzhen Qu
<yingzhen...@futurewei.com <mailto:yingzhen...@futurewei.com>>, wrote:
Hi Peter,
My understanding of flex-algo is that for traffic destined to a
prefix on a particular algo, it can only be routed on routers
belong to that algo, which also means only routers in that algo
calculates how to reach that prefix and install it into the
routing table. It seems to me that using flex-algo (section 12 of
the draft) it's possible to have a loopback address associated
with only one algo, please correct me if I'm missing or
misunderstood something.
Thanks,
Yingzhen
On 10/2/20, 9:43 AM, "Lsr on behalf of Peter Psenak"
<lsr-boun...@ietf.org <mailto:lsr-boun...@ietf.org> on behalf of
ppsenak=40cisco....@dmarc.ietf.org
<mailto:40cisco....@dmarc.ietf.org>> wrote:
Gyan,
On 02/10/2020 18:30, Gyan Mishra wrote:
All,
With SRv6 and IP based flex algo a generic question as it applies to
both. Is it possible to have within a single IGP domain different
sets
of nodes or segments of the network running different algorithms.
absolutely.
From
both drafts it sounds like all nodes have to agree on same algorithm
similar to concept of metric and reference bandwidth all have to have
the same style metric and play to the same sheet of music.
all participating nodes need to agree on the definition of the
flex-algo
and advertise the participation. That's it.
If there was
a way to use multiple algorithms simultaneously based on SFC or
services
and instantiation of specific algorithm based on service to be
rendered. Doing so without causing a routing loop or sub optimal
routing.
you can certainly use multiple algorithms simultaneously and use algo
specific paths to forward specific traffic over it. How that is done
from the forwarding perspective depends in which forwarding plane you
use. Flex-algo control plane is independent of the forwarding plane.
I thought with flex algo that there exists a feature that on
each hop there is a way to specify which algo to use hop by hop
similar
to a hop by hop policy based routing.
no, there is no hop-by-hop classification, that is problematic and
does
not scale for high speeds. Classification is done at the ingress only.
thanks,
Peter
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