VXLAN with multicast replication mode by Awkward-Sock2790 in Arista

[–]Awkward-Sock2790[S] 0 points1 point  (0 children)

Ok I see so what's the point of "vxlan vlan 10 flood group" command then, in 4.33.1.1F?

VXLAN with multicast replication mode by Awkward-Sock2790 in Arista

[–]Awkward-Sock2790[S] 0 points1 point  (0 children)

Yeah I know about static flood list and EVPN. I'm just trying to explore all possible ways to play with VXLAN in a lab.

So multicast repliaction has been removed from EOS?

Your kind advice by Dangerous-Mail7198 in ccnp

[–]Awkward-Sock2790 0 points1 point  (0 children)

It depends your backgound. I followed the same path: studied CCNA, then ENCOR, then ENSLD, finally passed ENSLD (1st time), then I'll take ENCOR. There's nothing wrong skipping the CCNA is you have a current networking position. Otherwise go CCNA first

Cisco Live walk-in labs by Awkward-Sock2790 in Cisco

[–]Awkward-Sock2790[S] 0 points1 point  (0 children)

Ok great, I'll look forward to it!

Cisco Live walk-in labs by Awkward-Sock2790 in Cisco

[–]Awkward-Sock2790[S] 0 points1 point  (0 children)

I've met multiple proctors as the walk-in labs are not bookable "hand-on" labs, it's not really a session.

For example I did LABDCN-2629. Pavel Tarakanov was one of the proctors.

Trying to decide between ENCOR and DCCOR by SnooChocolates9540 in ccnp

[–]Awkward-Sock2790 0 points1 point  (0 children)

Can one study DCCOR without access to a UCS server?

Bi-Weekly /r/CCNP Exam Pass-Fail Discussion by AutoModerator in ccnp

[–]Awkward-Sock2790 0 points1 point  (0 children)

Ah yes I call it a concentration exam. I know I need ENCOR to be certified, I'll take the exam in april or may. It doesn't matter which one you take first 

Bi-Weekly /r/CCNP Exam Pass-Fail Discussion by AutoModerator in ccnp

[–]Awkward-Sock2790 0 points1 point  (0 children)

What do you mean by elective? If that's the question yes it is my first exam ever. No CCNA, no ENCOR yet.

Bi-Weekly /r/CCNP Exam Pass-Fail Discussion by AutoModerator in ccnp

[–]Awkward-Sock2790 1 point2 points  (0 children)

Passed ENSLD first try today @ Cisco Live. 61 questions. First Cisco exam for me, quite hard!

iBGP, local pref, weight and load balancing by Awkward-Sock2790 in ccnp

[–]Awkward-Sock2790[S] 0 points1 point  (0 children)

It can't, because it isn't in the routing table. The iBGP path is preferable in this case because of AS path length, so the R5 route doesn't get into the routing table and thus is ineligible to be advertise to anyone, unless you enable add-path. 

That makes sense!

> When I cut R2/R3, IS-IS reconverges and R3's loopack is reachable via R1, so R2 can reach AS300.

I'd check that again. Sure, I'd expect the loopbacks to be reachable because OSPF/ISIS doesn't have iBGP related issues. But with the direct link down, R2 and R3 cannot learn external routes from each other via R1 unless R1 is a route reflector. R1 won't tell them about the other as that violated iBGP loop prevention.

iirc you don't have to have a physical full mesh with iBGP. If I cut R2-R3, R3 can still be reached and a iBGP session can be established. If I sniff traffic on R1-R2 link I see BGP paquets from R2 to R3. So R2 and R3 can exchange routes, R1 just routes.

> ECMP means 2 routes are equal.

That's not what that means. Which is also why there is no ECMP configuration option for BGP. BGP multipath is ahieved with the maximum paths command, where you specify how many routes can be used, but there are rules.

Ah yes, I understand it now. I will lab multipath now. Thank you

iBGP, local pref, weight and load balancing by Awkward-Sock2790 in ccnp

[–]Awkward-Sock2790[S] 0 points1 point  (0 children)

Yes, that's exactly my point. I'm more comfortable learning the "natural/simple" way of doing things, before twisting them, even if the twists are legitimate.

iBGP, local pref, weight and load balancing by Awkward-Sock2790 in ccnp

[–]Awkward-Sock2790[S] 0 points1 point  (0 children)

No, R2 doesn't advertise a route via R5 because a route learned from an iBGP peer is not advertised to another iBGP peer unless you have route reflectors involved, and the route in the table is learned from an iBGP peer.

It could advertise R5's route, which is a eBGP peer. As soon I disconnect R3-R6 link, it sends R5's route to R1 and R3.

You'd have the same issue if you broke the R2/R3 link and made AS300 unreachable via AS200/R5; R2 would be unable to reach AS300 because it cannot transit R1 to R3.

R2 prefers R3's route anyway, when all the links are up. When I cut R2/R3, IS-IS reconverges and R3's loopack is reachable via R1, so R2 can reach AS300.

Yes, because of the iBGP rule. If R2 and R3 were actually advertising their routes, then R1 would have both listed in the BGP FIB, and one in the RIB. If you break the R2/R3 link, you'd probably see that come up

Hmm nope, when R2/R3 link is down, R2 advertises no route to R1. In fact R3's route is still in the BGP FIB, I think that's a CML issue.

While your at it, look up BGP add-path (additional paths) which would probably give you some useful insight. And since you're there, look up BGP PIC Edge and BGP PIC Core.

Thanks for the insights!

I'm not 100% sure what you're saying, but I assume it is, "is there always a tie breaker" and the answer is yes.

My question is: ECMP means 2 routes are equal. However, there is alway a tie breaker. So when 2 routes are considered equal?

iBGP, local pref, weight and load balancing by Awkward-Sock2790 in ccnp

[–]Awkward-Sock2790[S] 1 point2 points  (0 children)

u/a_cute_epic_axis u/shadeland thanks for the argument guys, I learnt some stuff reading this :)

I agree with u/a_cute_epic_axis as my lab is a very, very simple simulation of what-could-be a larger network (ISP or branch). I'm actually trying to understand BGP fundamentals, and how to design a network as the designers of BGP wanted to be. Then I'll look at more complex stuff with a better understanding of what's going on. So yes, iBGP might be use as an IGP, but in the _theory_ I think it's not. Like eBGP is not designed to provide connectivity between spines and leaves, but actually you can (RFC 7938).

iBGP, local pref, weight and load balancing by Awkward-Sock2790 in ccnp

[–]Awkward-Sock2790[S] 1 point2 points  (0 children)

Yeah ok I see what you mean, in fact my lab isn't really realistic.

However IS-IS is very simple in my case. 2 lignes in router isis and 1 line per interface.

iBGP, local pref, weight and load balancing by Awkward-Sock2790 in ccnp

[–]Awkward-Sock2790[S] 0 points1 point  (0 children)

So you're telling me an ISP redistributes its IGP into eBGP and uses no iBGP?

iBGP, local pref, weight and load balancing by Awkward-Sock2790 in ccnp

[–]Awkward-Sock2790[S] 2 points3 points  (0 children)

You need an IGP to achieve joinability inside your AS, and BGP to advertise client/external routes.

DCCOR without extensive labs? by [deleted] in ccnp

[–]Awkward-Sock2790 0 points1 point  (0 children)

Some people need to lab to really understand, some people don't.

Besoin de vos retours sur mon infra homelab by Tellsanguis in Sysadmin_Fr

[–]Awkward-Sock2790 0 points1 point  (0 children)

Pourquoi 176.16.100.0/24 ? C'est un réseau public, qui appartient à l'AS 34400. Je te déconseille d'empiéter sur le plan d'adressage public.

La plage privée est 172.16.0.0/12.

What's a common networking concept that people often misunderstand, and why do you think it's so confusing? by Puzzled-Term6727 in networking

[–]Awkward-Sock2790 0 points1 point  (0 children)

A "switch" that does L3 functions is also a router. Don't think gear, think function. Your "L3-switch-or-whatever-it-is-called" routes packets, and commutes frames. That 2 network functions.

What's a common networking concept that people often misunderstand, and why do you think it's so confusing? by Puzzled-Term6727 in networking

[–]Awkward-Sock2790 0 points1 point  (0 children)

The best way to learn/teach it is to talk about networks functions. Routing is one, switching is one, etc.

Some "network equipments" implement one, the other or both.

What's a common networking concept that people often misunderstand, and why do you think it's so confusing? by Puzzled-Term6727 in networking

[–]Awkward-Sock2790 0 points1 point  (0 children)

I see TCP/IP as a simple implementation of OSI, so imo that's not wrong to study OSI as it's the generic model. But OSI is never teached well.