Re: Broadcast medium on serial for OSPF

From: Michael Jones (majonestx@gmail.com)
Date: Fri Aug 01 2008 - 14:21:06 ART


Am is missing something here ?

Here we have a relationshipp built using two non-broadcast serial interfaces
(default) with just map statements ?

Rack1R1#sho ip ospf ne
Neighbor ID Pri State Dead Time Address Interface
 25.0.0.2 1 FULL/BDR 00:01:41 12.0.0.2 Serial0/0
14.0.0.4 0 FULL/DROTHER 00:00:36 14.0.0.4
    FastEthernet0/0

No ospf network type change on interface ?????????????

Rack1R1#sho run int serial 0/0
Building configuration...

Current configuration : 156 bytes
!
interface Serial0/0
 ip address 12.0.0.1 255.0.0.0
 encapsulation frame-relay
 frame-relay map ip 12.0.0.2 102 broadcast
 no frame-relay inverse-arp
end
Serial interface still in its default settings ???????????

Rack1R1#sho ip ospf int se
Rack1R1#sho ip ospf int serial 0/0
Serial0/0 is up, line protocol is up
  Internet Address 12.0.0.1/8, Area 0
  Process ID 1, Router ID 14.0.0.1, Network Type NON_BROADCAST, Cost: 64
  Transmit Delay is 1 sec, State DR, Priority 1
  Designated Router (ID) 14.0.0.1, Interface address 12.0.0.1
  Backup Designated router (ID) 25.0.0.2, Interface address 12.0.0.2
  Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
    oob-resync timeout 120
    Hello due in 00:00:15
  Supports Link-local Signaling (LLS)
  Index 3/3, flood queue length 0
  Next 0x0(0)/0x0(0)
  Last flood scan length is 1, maximum is 2
  Last flood scan time is 0 msec, maximum is 4 msec
  Neighbor Count is 1, Adjacent neighbor count is 1
    Adjacent with neighbor 25.0.0.2 (Backup Designated Router)
  Suppress hello for 0 neighbor(s)

Yet I still have an adjacency, please keep in mind I've been studying since
7am this morning- so i could be missing something stupid.

On Fri, Aug 1, 2008 at 11:06 AM, ehiwe peter <ccie.in.nigeria@gmail.com>wrote:

> You can form ospf neighbor relationship and exchange updates without
> changing the network type by using the neighbor command which does things in
> unicast format.
>
> The map statement with broadcast keyword just allows broadcasts and
> multicast to be sent on that pvc.
>
> IF u r going to use the default network type on the interface then the
> broadcast keyword on the frame map statement is not necesary since the
> interface does not allow broadcast anyway.
>
> Also , The relationship btw network type on the interface and the broadcast
> statement on the map statement is not that of one over ruling the other.
>
> On Fri, Aug 1, 2008 at 4:00 PM, Michael Jones <majonestx@gmail.com>wrote:
>
>> Quick questions friends....
>>
>>
>> I understand the serial in a non brodacast medium by default. I also
>> understand the diff types of ospf networks.
>>
>> My question is if you have a map statement allowing broadcast ex.
>> frame-relay map ip 10.0.0.5 broadcast
>>
>> Yet the serial interface is non-broadcast by default ex- below
>>
>> Rack1R2#sho ip ospf int serial 0/0
>> Serial0/0 is up, line protocol is up
>> Internet Address 10.0.0.2/8, Area 0
>> Process ID 1, Router ID 10.0.0.2, Network Type NON_BROADCAST, Cost: 64
>> Transmit Delay is 1 sec, State DR, Priority 1
>> Designated Router (ID) 10.0.0.2, Interface address 10.0.0.2
>> No backup designated router on this network
>> Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
>> oob-resync timeout 120
>> Hello due in 00:00:00
>> Index 1/1, flood queue length 0
>> Next 0x0(0)/0x0(0)
>> Last flood scan length is 0, maximum is 1
>> Last flood scan time is 0 msec, maximum is 0 msec
>> Neighbor Count is 0, Adjacent neighbor count is 0
>> Suppress hello for 0 neighbor(s)
>>
>> Would I be correct in assuming there is now way to form and ospf
>> relationship if i dont manipulate the ospf network/interface type ?
>>
>> The interface/network type over rules the map statment, correct ?
>>
>>
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>>
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