6 votes

What are any disadvantages of redistributing eBGP routes into IGP

To answer your specific question: no, there's no "conceptual" or fundamental reason not to redistribute. There are a few practical considerations, but you seem to already be aware of most ...
Ron Trunk's user avatar
  • 67.3k
6 votes
Accepted

Why OSPF E1 and E2 exist?

RFC 2328, OSPF Version 2 defines the Type 1 and Type 2 external metrics. Type 1 metrics are used if the primary cost is internal to your AS, but Type 2 metrics are used if the primary cost is external ...
Ron Maupin's user avatar
  • 99.4k
4 votes
Accepted

What are the biggest problem in distributed processing?

Especially with China, you'd have to cope with the GFW, rendering reasonable data exchange unreliable at best and impossible at worst. We've pretty much given up working seriously with China on a ...
Zac67's user avatar
  • 83.9k
4 votes
Accepted

isis redistribute bgp not working

By default redistribution of IBGP into an IGP is disabled. To redistribute IBGP routes into an IGP, you need the command bgp redistribute-internal. Configuring this on B will inject BGP routes into ...
surya's user avatar
  • 400
3 votes

BGP <-> OSPF Route Redistribution Loops

Without configurations for some of the other routers (RO-4/RO-1) we're basically guessing. However, this sounds like a classic issue of your own routes being announced back to you. If "ISP-2"...
Ricky's user avatar
  • 32.1k
3 votes
Accepted

OSPF Border Router Discovery

There is no specific discovery for border routers. You need to understand more about OSPF and the LSAs which it advertises. Every router in an area knows the complete topology of the area in which it ...
Ron Maupin's user avatar
  • 99.4k
3 votes

In what case should the core router having iBPG configured or having routes redistributed via OSPF to it?

If R1 and R2 holds full internet routing table answer is never. Only default route should redistributed towards OSPF in some occasions maybe you would need to redistribute certain prefixes into OSPF ...
Datagram.Network's user avatar
3 votes

What is the difference between GPON ONU and ONT?

ONU is the IEEE term while ONT is the ITU-T term. Both mean the same thing.
Zac67's user avatar
  • 83.9k
3 votes
Accepted

EIGRP to BGP to EIGRP

I think you are misunderstanding a fundamental concept of routing protocols. Routing protocols do not route packets. They exchange routing information (reachability) with other routers. You run a ...
Ron Trunk's user avatar
  • 67.3k
3 votes
Accepted

Filter tagged route to downstream routers

You are correct to attempt your filtering on a ABR router ospf 1 ... distribute-list route-map RMAPDENYEIGRP in The distribute-list command above does not stop the propagation of OSPF LSA's in ...
Darrell Root's user avatar
  • 2,193
3 votes

Is the redistribution default-metric value when used over vPC peer link based on port channel aggregated bandwidth or individual physical Interface?

VPC isn't really relevant here. All SVI's (whether mapped to a VPC peer link, some other random trunk or just a bunch of access ports) end up with the same bandwidth value by default. You can adjust ...
rnxrx's user avatar
  • 6,114
3 votes

BGP <-> OSPF Route Redistribution Loops

I do the same in my network, but it does work. I think the difference here is the tagging that you use to redistribute, and is not supported as you mentioned. You can do the filtering on the route map ...
Gabriel Lacerda's user avatar
2 votes

What is route leaking?

What roughly I understand is, advertising route from one vrf table to other. In the context of MPLS, yes. Or, leaking from the global table into one or more VRFs. It is also used in other places, e....
Ron Trunk's user avatar
  • 67.3k
2 votes

Why does my route-map blackhole some equally specific routes?

The network statement functions differently in OSPF and BGP. In BGP, the network statement specifies which networks in the routing table will be advertised to BGP peers. In contrast, in OSPF the ...
Ron Trunk's user avatar
  • 67.3k
2 votes

What are the biggest problem in distributed processing?

With any supplier, you also have to consider commercial and legal constraints; when those suppliers are in a different country, even more so. If the data is originating in the European Union, there ...
jonathanjo's user avatar
  • 16.2k
2 votes

Why should we replicate route before doing inter-vrf redistribution

There are multiple ways to accomplish route leaking. Both redistribute vrf ... and route-replicate will accomplish this.
Ron Trunk's user avatar
  • 67.3k
2 votes

OSPF Border Router Discovery

R12 is an ASBR. It's the only one flooding Type 5 LSAs.
Ron Trunk's user avatar
  • 67.3k
1 vote

BGP <-> OSPF Route Redistribution Loops

Had this conversation yesterday. Communities sound complex but are really just tags for BGP. There are a few different ways that you could potentially resolve this. Looking at the topology I am ...
Steve Martin's user avatar
1 vote

In a PE-CE network, we would redistribute routes between BGP and IGP without `bgp redistribute-internal`. How does redistribution works?

From: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/command/irg-cr-book/bgp-a1.html?bookSearch=true#wp4270480859 Command Default In releases prior to Cisco IOS Release 15.1(2)S, 15.2(...
manish ma's user avatar
  • 1,604
1 vote

BGP <-> OSPF Route Redistribution Loops

You have a couple of route-maps that are almost correct. Like you surmised, you need to use communities within BGP routing-policy. ip community-list standard permit from-ospf <asn>:1 route-map ...
Jeff Wheeler's user avatar
  • 5,449
1 vote

Why is ospf to bgp redistribution and simultaneous bgp to ospf redistribution dangerous?

It is only a problem if you have more than one mutual redistribution router. In that case you will likely create a routing loop. In larger networks there may be more than one router redistributing ...
Ron Trunk's user avatar
  • 67.3k
1 vote
Accepted

Why is ospf to bgp redistribution and simultaneous bgp to ospf redistribution dangerous?

Mutual redistribution can be dangerous because you can get in a situation where each routing protocol gets back through redistribution the same routes it already had. One way around this for Cisco ...
Ron Maupin's user avatar
  • 99.4k
1 vote
Accepted

How to configure a distributed network for the replication?

You'll want to find some devices or software that are designed to establish VPN connections and read the documentation for how to set it up. Many networks use the network firewall as a VPN endpoint. ...
Todd Wilcox's user avatar
  • 1,135
1 vote

OSPF Route Tagging and BGP AS Prepend

Based on your comment: I'm trying to prevent any routes with a tag of 12000 from being redistributed into the MPLS. Any routes redistributed into OSPF from EIGRP will be OSPF external routes. It ...
Ron Maupin's user avatar
  • 99.4k

Only top scored, non community-wiki answers of a minimum length are eligible