Can anyone explain to me in simple terms what the difference is between IS-IS single topology and multitopology?
The documents available online are very confusing and conflicting, even cisco's.
I have tried to simulate both on my labs and cannot still understand the difference.
lsdbis shared with
ipv4 and ipv6address families. Can someone show me how to figure this out in
show isis database?
Solved! Go to Solution.
did you find this page ? ISIS for IPv6 ⋆ IpCisco
it is just what is says, with single topology
IPv4 and IPv6
share the same topology
with multi topology there can be a different topology created for
and another for
NB! the topologies can also look the same (same components, same links between components)
but still it is
because they are separately administrated
Could you explain this a bit further please "NB! the topologies can also look the same (same components, same links between components)
but still it is
because they are separately administrated"
Thanks for your response
"When would I need to use either ST or MT? (as in use-case)"
The only use-cases that pop to mind for using a
multi-topology (for IPv4 and IPv6)
might be the two topologies are very disjoint, and SPF might have somewhat less work computing each, separately (along with possibly doing such computation faster). Second, possibly you might cost the same link differently when using two topologies. Another reason would be to very much control what's exchanged between the two topologies (which I've done using multiple OSPF processes on the same devices, but without the issues attended with routing between
IPv4 and iPv6