All Questions
76
questions
3
votes
2
answers
380
views
In router's config, why do I need to advertise the directly connected network?
I have learned that, in routing config, a router must advertise all of its networks.
For example, in this topo:
Router A need to network 192.168.1.1 0.0.0.255 and network 100.1.1.2 0.0.0.255
But why ...
- 131
0
votes
1
answer
136
views
How to properly configure OSPF protocol?
I have this simple 3 router network that I need to configure the OSPF for, when using two routers every thing works fine and i can ping but when I add the third router nothing works
left router
...
0
votes
1
answer
130
views
OSPF area or ABR impact on CPU and RAM consumption
I have two statments on OSPF, are they correct?
1- If I split a single area OSPF to an OSPF domain with area 0 and area 1, and there is just one ABR between area 0 and area 1, The load on CPU will ...
- 551
2
votes
1
answer
691
views
OSPF routes are not advertised
routers with ASBR2 connecting to AREA 0 and 10 and ASBR1 connecting to area 0 and 20, there's no entry of routes in R1's routing table, help me out
R1#sh run
Building configuration...
Current ...
- 61
3
votes
1
answer
149
views
Setting an OSPF router in one area that doesn't see other areas
Could an OSPF router be configured so that it can only see its own area LSAs and does not accept LSAs from other areas? (For example, if it is in area 2, its routing table just shows routes in area 2, ...
- 551
2
votes
3
answers
714
views
Why does OSPF use flooding despite using multicast?
We know that flooding is only possible in layer2 switch. But in OSPF router in layer3 uses flooding with multicasting. Suppose we have one router in OSPF uses multicast address 225.0.0.9. If router ...
- 398
-1
votes
2
answers
221
views
How in Distance vector routing one router communicates adjacent router through broadcast address and OSPF uses unicast with another?
In distance vector routing algorithm one router can communicates(shared the routing table) with adjacent router by broadcasting message which are in same subnet. OSPF uses flooding to unicast message ...
- 398
1
vote
1
answer
421
views
Can't ping neighboring router OSPF
I have set up an OSPF network and I cannot ping from the Edge router to Main Branch.
- 11
2
votes
1
answer
714
views
Is it possible to have a second ASBR in my OSPF area 0?
I have three routers in area 0, two of which are connected to separate WAN circuits. I have one router that is sending the default route but when I try to add a second router with the configuration ...
- 93
1
vote
2
answers
185
views
Routing Protocols and sharing information
I am running multiple Protocols on different Routers as so:
R1-RIPv2 EIGRP OSPF
R2-OSPF and RIPv2
R3-RIPv2 and EIGRP
R4-EIGRP and OSPF
This is not a practical exercise, it is just to explore how ...
- 69
1
vote
1
answer
545
views
PacketTracer: Why can I not ping from one to another router?
I'm trying to ping from Router DC_GE to BE:
I uploaded the Packet Tracer File (v. 7.2.1):
https://www.4shared.com/file/aEsd_0Piiq/Topologie_Ausgangspunkt_MH.html
CD_GE:
CD_GE#show running-config
...
- 121
0
votes
1
answer
341
views
I need help in creating OSPF between MultiLayerSwitch and Routers in packet tracer
I know we cannot create OSPF with different subnets. What network addresses should I put in the MLS and R1 to make it adjacent?
Here's the configuration for MLS:
interface FastEthernet0/15
no ...
user60231
2
votes
1
answer
609
views
Is OSPF router ID unique per area?
I found online that the router ID must be unique within the OSPF domain. But what exactly is an OSPF domain (an area?). Let's take the following topology:
Can R1 and R5 have the same router ID, as ...
- 871
3
votes
3
answers
248
views
Why can the BGP protocol be implemented across routers, but the OSPF protocol can only be implemented direct connected routers?
Why can the BGP protocol be implemented across routers?
But the OSPF protocol can only be implemented on directly connected routers?
Is the OSPF protocol based on IP? we know the BGP is based on ...
- 1,777
3
votes
1
answer
668
views
Is this a valid OSPF topology?
In the following topology:
every Backbone router is an ABR.
Router 2 belongs to three different areas, area 0, area 1, and area 4.
is this a valid topology for OSPF ? it works as expected and it ...
- 57