From: Sean C (Upp_and_Upp@hotmail.com)
Date: Thu May 05 2005 - 11:37:38 GMT-3
John,
You write: "Its only needed where when you trying to prevent the router
from becoming a DR in a broadcast, non-broadcast or point-to-multipoint
non-broadcast network type."
Priority is required for:
Broadcast
Non-broadcast
Both broadcast and non-broadcast hold DR/BDR elections. I do not believe
Point-to-Multipoint on-broadcast holds a DR/BDR election.
Coincidently, I've been looking for the last 30 mins on cisco.com and
googled to find something that explicitly states this in easy language.
Perhaps a chart like the one NMC uses to explain the OSPF network types. I
haven't been able to an appropriate chart, description though.
Sean
----- Original Message -----
From: "john matijevic" <john.matijevic@gmail.com>
To: "Kumar, Manoj" <manoj.kumar@citigroup.com>
Cc: <ccielab@groupstudy.com>
Sent: Thursday, May 05, 2005 7:34 AM
Subject: Re: OSPF
> Hello Manoj,
> First step would be to remove ip ospf priority 0 on R6 Serial interface,
> this is not needed, because ospf is configured with a point-to-multipoint
> network type. Its only needed where when you trying to prevent the router
> from becoming a DR in a broadcast, non-broadcast or point-to-multipoint
> non-broadcast network type. Also check your MTU settings to see if you
> have
> set the mtu on the interface. Also if you may want to remove ospf protocol
> reload the router, and reenter the ospf configuration.
> Sincerely,
> John
>
> http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f0d.
> shtml
> On 5/5/05, Kumar, Manoj <manoj.kumar@citigroup.com> wrote:
>>
>> Gents,
>>
>> In my lab, I have a topology where R2 is the FR hub and R5, R6 form the
>> spokes. I got to run OSPF and R2 and R5 form OSPF neighbors over FR with
>> no
>> issues, R6 is getting stuck at EXSTART with both R5 and R6 over FR. R6 is
>> forming OSPF with R5 over ETHERNET with no issues.
>>
>> I tried neighbor commands between R2 & R6, R5 & R6.
>> I tried 'ip ospf network point-to-multipoint non-broadcast on all three
>> routers' FR interfaces
>>
>> Please help and the config for R2 & R6 is given below.
>>
>> R2#sh running-config
>> Building configuration...
>>
>> Current configuration : 2538 bytes
>> !
>> version 12.2
>> service timestamps debug uptime
>> service timestamps log uptime
>> no service password-encryption
>> !
>> hostname R2
>> !
>> !
>> ip subnet-zero
>> !
>> !
>> !
>> !
>> call rsvp-sync
>> !
>> !
>> !
>> !
>> !
>> !
>> !
>> !
>> interface Loopback0
>> description *** LOOPBACK FOR R2 ***
>> ip address 200.0.0.2 <http://200.0.0.2>
> 255.255.255.255<http://255.255.255.255>
>> !
>> interface Loopback1
>> ip address 172.16.0.1 <http://172.16.0.1> 255.255.0.0
>> <http://255.255.0.0>
>> !
>> interface FastEthernet0/0
>> no ip address
>> duplex auto
>> speed auto
>> !
>> interface Serial0/0
>> no ip address
>> encapsulation frame-relay
>> no fair-queue
>> no arp frame-relay
>> cdp enable
>> no frame-relay inverse-arp
>> frame-relay lmi-type cisco
>> !
>> interface Serial0/0.24 point-to-point
>> ip address 150.50.24.2 <http://150.50.24.2>
> 255.255.255.0<http://255.255.255.0>
>> ip policy route-map greenandgold
>> no arp frame-relay
>> frame-relay interface-dlci 104
>> !
>> interface Serial0/0.256 multipoint
>> ip address 150.50.100.2 <http://150.50.100.2>
> 255.255.255.224<http://255.255.255.224>
>> ip ospf network point-to-multipoint
>> no arp frame-relay
>> frame-relay map ip 150.50.100.2 <http://150.50.100.2> 105
>> frame-relay map ip 150.50.100.5 <http://150.50.100.5> 105 broadcast
>> frame-relay map ip 150.50.100.6 <http://150.50.100.6> 106 broadcast
>> no frame-relay inverse-arp
>> !
>> interface FastEthernet0/1
>> description *** LAN CONN TO R1-FE0-0 ***
>> ip address 150.50.17.2 <http://150.50.17.2>
> 255.255.255.0<http://255.255.255.0>
>> ip policy route-map greenandgold
>> duplex auto
>> speed auto
>> !
>> interface Serial0/1
>> no ip address
>> shutdown
>> !
>> router eigrp 1
>> redistribute ospf 10 metric 100000 1 255 1 1
>> network 150.50.24.0 <http://150.50.24.0> 0.0.0.255 <http://0.0.0.255>
>> no auto-summary
>> !
>> router ospf 10
>> log-adjacency-changes
>> redistribute connected subnets route-map task10
>> redistribute static subnets
>> redistribute rip subnets
>> passive-interface Serial0/0.24
>> passive-interface FastEthernet0/1
>> passive-interface Loopback0
>> network 150.50.7.0 <http://150.50.7.0> 0.0.0.127 <http://0.0.0.127> area
>> 1
>> network 150.50.100.0 <http://150.50.100.0> 0.0.0.31 <http://0.0.0.31>
>> area
>> 0
>> default-information originate always
>> !
>> router rip
>> passive-interface Serial0/0.24
>> passive-interface Serial0/0.256
>> network 150.50.0.0 <http://150.50.0.0>
>> no auto-summary
>> !
>> ip classless
>> ip default-network 172.16.0.0 <http://172.16.0.0>
>> ip route 200.0.0.1 <http://200.0.0.1>
> 255.255.255.255<http://255.255.255.255>
>> 150.50.17.1 <http://150.50.17.1>
>> ip http server
>> !
>> !
>> map-class frame-relay R2_ts
>> frame-relay adaptive-shaping becn
>> frame-relay cir 64000
>> frame-relay bc 8000
>> frame-relay be 8000
>> frame-relay mincir 32000
>> access-list 100 permit icmp host 10.1.1.4 <http://10.1.1.4>
> 150.50.5.64<http://150.50.5.64>
>> 0.0.0.31 <http://0.0.0.31>
>> access-list 101 permit icmp host 150.50.200.1 <http://150.50.200.1>
>> 150.50.5.64 <http://150.50.5.64> 0.0.0.31 <http://0.0.0.31>
>> route-map task10 permit 10
>> match interface Loopback0 Loopback1
>> !
>> route-map greenandgold permit 10
>> match ip address 100
>> set ip next-hop 150.50.100.5 <http://150.50.100.5>
>> !
>> route-map greenandgold permit 20
>> match ip address 101
>> set ip next-hop 150.50.100.6 <http://150.50.100.6>
>> !
>> !
>> dial-peer cor custom
>> !
>> !
>> !
>> !
>> !
>> line con 0
>> line aux 0
>> line vty 0 4
>> login
>> !
>> end
>>
>> R6#sh running-config
>> Building configuration...
>>
>> Current configuration : 1461 bytes
>> !
>> version 12.2
>> service timestamps debug uptime
>> service timestamps log uptime
>> no service password-encryption
>> !
>> hostname R6
>> !
>> !
>> ip subnet-zero
>> !
>> !
>> !
>> !
>> call rsvp-sync
>> !
>> !
>> !
>> !
>> !
>> !
>> !
>> !
>> interface Loopback0
>> ip address 200.0.0.6 <http://200.0.0.6>
> 255.255.255.255<http://255.255.255.255>
>> !
>> interface FastEthernet0/0
>> description *** LAN CONN TO CAT3550-2-FE0-6 ***
>> ip address 150.50.7.6 <http://150.50.7.6>
> 255.255.255.128<http://255.255.255.128>
>> ip ospf network point-to-multipoint
>> delay 100000
>> duplex auto
>> speed auto
>> !
>> interface Serial0/0
>> no ip address
>> ip ospf priority 0
>> shutdown
>> !
>> interface BRI0/0
>> no ip address
>> encapsulation hdlc
>> shutdown
>> !
>> interface FastEthernet0/1
>> no ip address
>> shutdown
>> duplex auto
>> speed auto
>> !
>> interface Serial0/1
>> no ip address
>> ip ospf priority 0
>> shutdown
>> !
>> interface Serial1/0
>> bandwidth 1544
>> ip address 150.50.100.6 <http://150.50.100.6>
> 255.255.255.224<http://255.255.255.224>
>> encapsulation frame-relay
>> ip ospf network point-to-multipoint
>> ip ospf priority 0
>> no fair-queue
>> no arp frame-relay
>> frame-relay map ip 150.50.100.2 <http://150.50.100.2> 601 broadcast
>> frame-relay map ip 150.50.100.5 <http://150.50.100.5> 605 broadcast
>> frame-relay map ip 150.50.100.6 <http://150.50.100.6> 601
>> no frame-relay inverse-arp
>> frame-relay lmi-type cisco
>> !
>> interface Serial1/1
>> no ip address
>> shutdown
>> !
>> interface Serial1/2
>> no ip address
>> shutdown
>> !
>> interface Serial1/3
>> no ip address
>> shutdown
>> !
>> router ospf 10
>> log-adjacency-changes
>> network 150.50.7.0 <http://150.50.7.0> 0.0.0.127 <http://0.0.0.127> area
>> 1
>> network 150.50.100.0 <http://150.50.100.0> 0.0.0.31 <http://0.0.0.31>
>> area
>> 0
>> !
>> ip classless
>> ip http server
>> !
>> !
>> dial-peer cor custom
>> !
>> !
>> !
>> !
>> !
>> line con 0
>> line aux 0
>> line vty 0 4
>> login
>> !
>> end
>>
>> R6#
>>
>> Kind Regards,
>>
>> Manoj Ku
>>
>> _______________________________________________________________________
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>> http://www.groupstudy.com/list/CCIELab.html
>>
>
>
>
> --
> John Matijevic, CCIE #13254
> U.S. Installation Group
> Senior Network Engineer
> 954-969-7160 ext. 1147 (office)
> 305-321-6232 (cell)
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
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