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Questions tagged [redistribution]

For questions about or involving route redistribution in a routing protocol. For instance, you need to find out why OSPF does not redistribute your routes.

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Why redistributed routes do not overwrite the original ones?

I am looking a bit into mutual redistribution and I am trying to find out how a router decides which routes to redistribute and why. R1 --ospf-- R2 --rip-- R3 Imagine the above scenario, in which R2 ...
Marcus's user avatar
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Redistribution Loops and Route Tagging

I've read that when we configure multipoint redistribution, it's a good idea to tag our routes to prevent them from being advertised from Protocol 1 - Protocol 2 - Back to Protocol 1. Source: ...
Mitrixsen's user avatar
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Can you filter specific prefixes from a redistributed EIGRP summary route?

Say I have an EIGRP router advertising the summary address 192.168.128.0/22 and on a connected router I'm redistributing EIGRP routes into OSPF. Is there any way for me to only redistribute 192.168....
Zach's user avatar
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What are any disadvantages of redistributing eBGP routes into IGP

I wonder if there are any conceptual disadvantages of redistributing routes learned through eBGP peerings into an IGP, like OSPF. I have read of course about performance issues and the risk of ...
Patrick Aszody's user avatar
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Why should we replicate route before doing inter-vrf redistribution

Consider a network topology like - +-------------------------------------------------+ +--------------------|-----------------------------+ | | ...
Deepak's user avatar
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In a PE-CE network, we would redistribute routes between BGP and IGP without `bgp redistribute-internal`. How does redistribution works?

In a PE-CE network deployment on Cisco IOS/XE devices like - +-------------+ ...
Deepak's user avatar
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2 votes
5 answers
4k views

BGP <-> OSPF Route Redistribution Loops

In the following topology I have a multi-point redistribution from BGP <-> OSPF and I have recently encountered a routing loop. After further reading I have understood the problematic routers ...
Lee's user avatar
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833 views

What is route leaking?

I tried googling, but didn't find a good article explaining this. What roughly i understand it, advertising route from one vrf table to other. What type of routes (static, connected, dynamic routes) ...
Deepak's user avatar
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isis redistribute bgp not working

I am having trouble getting route redistribution into ISIS working. It works from ISIS to BGP, but I can't get the opposite to show up. I am using IOS-XR Network has 3 routers: A----B----C A and B ...
Colin Z's user avatar
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1 answer
2k views

EIGRP to BGP to EIGRP

I would like to ask if it is possible to implement eigrp routing sent through bgp? I wanted to route from PC-1 to PC-2 using EIGRP. The connection between all of the three routers are through BGP ...
chiajw1's user avatar
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Filter tagged route to downstream routers

I'd like to filter a redistributed route from EIGRP into OSPF to all routers in AREA2 and AREA34. I have tagged the route 10.90.100.0/24 with tag 90 at the Tampa router where its redistributed into ...
Parakoopa's user avatar
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Why does my route-map blackhole some equally specific routes? [closed]

I have a challenging situation. I have two routers, in VIRL, sharing routes via BGP and OSPF I am attempting to remove the "network 0.0.0.0 255.255.255.255 area 0" from my OSPF process. I have tried ...
Shōgun8's user avatar
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What are the biggest problem in distributed processing?

Imagine that I have someone in Bejing who offers me his supercomputer for processing an intensive job. How does it compare sending job from Berlin to Bon,to sending the same job to Beijing? I am ...
MikiBelavista's user avatar
2 votes
1 answer
54 views

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

The question is in the title. Looking at a config where they were trying to Peering traffic over an SVI, but they have the physical interfaces bandwidth listed as the value and I am not sure if that ...
MrLazyNetworkAutomation's user avatar
3 votes
1 answer
2k views

Why OSPF E1 and E2 exist?

I know the difference between E1 and E2 metric-types. I know the preference level given to those routes. I know difference between Metric and Forwarding Metric and how it works. What I don't ...
Sajith S.K's user avatar
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2 answers
1k views

What is the difference between GPON ONU and ONT?

The Optical Network Unit (ONU) and the Optical Network Terminal (ONT) GEEPONs can both connect with an Optical Network Terminal (OLT) via fiber cables in order to achieve an Optical Distributed ...
Masssly's user avatar
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1 answer
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Redistribution VLSM networks to BGP neighbour with summarized 24 bit mask network

I received public BGP AS with network with 24 bit mask. Is it possible, to advertise on BGP router VLSM networks summarized to 24-bit mask (not for class membership)? Example: I receive 112.112.112....
Grzegorz Piechota's user avatar
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2 answers
4k views

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

I am referring to this question, where OP apparently fixed his issue by redistributing ospf in bgp and vice-versa on the same router. The user Sebastian warns that this is a dangerous practice. We ...
k0s1nsky's user avatar
1 vote
0 answers
308 views

OSPF NSSA - Type 7 LSA Metric Changes Unexpectedly

When a new path to an NSSA External (LSA type 7) route is brought up in the topology below, the existing path's cost to that route increments to exactly match the new path's cost. Therefore, both ...
Brett Lykins's user avatar
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1 vote
1 answer
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OSPF into BGP Redistribution issue

I am having trouble with basic OSPF redistribution into BGP. BGP peers between R10 and R12 are up. I have full connectivity between Area 0. R10 0/0 is also in that area. I cannot get BGP routes from ...
Peter G Mac.'s user avatar
1 vote
3 answers
239 views

OSPF Border Router Discovery

Hi how the routers in ospf network will discover the borders routers when i try to see the border routers with the show ip ospf border command i get : in Area 0 - R2 discover : all border ...
V For Vendetta's user avatar
3 votes
2 answers
103 views

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

I have the following topology. The notebook computer has to access the internet. In what case should R3 (as the core router & default gateway for the internal network) having iBPG configured or ...
Harold Chan's user avatar
1 vote
1 answer
53 views

How to configure a distributed network for the replication? [closed]

I want to replicate data (music, video, photos, user's data) across different geographical networks. How to connect several networks into a single network to let nodes comunicate to each other? ...
Oleksandr's user avatar
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2 answers
2k views

Why do static routes not need a "default-metric" set when redistributing into EIGRP?

Good Afternoon, I ran into an issue this morning where static routes on a certain device weren't being redistributed into an EIGRP process configured on the same device. I'd originally thought this ...
S Phillip R Simonds's user avatar
6 votes
2 answers
3k views

OSPF Route Tagging and BGP AS Prepend

Is it possible to perform the following configurations on Cisco routers, and are there any challenges with these types of configurations (mainly #3)? Match an OSPF route tag of 12000 (Definitely ...
Gregory R.'s user avatar
1 vote
1 answer
3k views

Redistribution between EIGRP and Static routing protocols

I have configured EIGRP and STATIC protocols between two areas and both protocols at Area border router. unfortunately I'm unable to ping between two areas, the networks are configured correctly and ...
zzlalani's user avatar
  • 113
4 votes
1 answer
584 views

EIGRP to iBGP metric calculation

Consider the following output: router#show ip bgp vpnv4 rd 300:1 5.5.5.5/26 BGP routing table entry for 300:1:5.5.5.5/26, version 538213 Paths: (2 available, best #2, no table) Advertised to ...
knotseh's user avatar
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9 votes
5 answers
5k views

Static redistribution into EIGRP as internal failure

I am redistributing a static route into EIGRP on a 6500. I had read here if you enter a network statement matching a static route that it would be redistributed as an internal route by EIGRP. However, ...
henklu's user avatar
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8 votes
1 answer
2k views

Does RIP to BGP redistribution for an MPLS VPN make sense?

A customer was recently adamant to perform redistribution of their RIPv2 routes into BGP. This is over a standard MPLS VPN solution whereby the CE routers are fully managed. This approach feels ...
MattE's user avatar
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