From: Mahmud, Yasser (YMahmud@Solutions.UK.ATT.com)
Date: Sun Jan 05 2003 - 19:41:50 GMT-3
Syv,
The below will work because you have specified neighbor commands so OSPF is
working in a unicast manner, however in the original email the solution 2
did not have the neighbor commands.
Solution:2 is what I would use if the rest of the lab doesn't require the
PVC's to be broadcast capable but you have to be very careful and remember
that you have not used the broadcast keyword and make sure that it doesn't
affect the other parts of the lab
Solution1: You could be safe and use the broadcast keyword anyway, but if it
is not needed elsewhere in the lab , I'm not sure if the proctor would take
marks off because you've configured it and it wasn't necessary for that
particular part of the lab. (like to know if there is consensus on this??)
Yasser
> -----Original Message-----
> From: syv [SMTP:syv@911networks.com]
> Sent: Sunday, January 05, 2003 10:06 PM
> To: Mahmud, Yasser
> Cc: ccielab@groupstudy.com
> Subject: Re[2]: Frame-relay & OSPF: 1/2 dozen or 6
>
> On Saturday, January 04, 2003, Mahmud, Yasser wrote:
>
> -----Original Message-----
> MY> Hi,
> MY> Your solution 2 won't work as the ospf network type is NBMA and so
> OSPF
> MY> assumes it can't send broadcasts.
>
> No it does work without setting the ip ospf network on the
> spoke or the hub:
>
> Here is the complete listings and the sho ip ospf interface
> and neighbors. It's a bit long but proof positive that it
> works.
>
> Hub
> =-=-=-=
>
> c1751#s
> Building configuration...
>
> Current configuration : 1673 bytes
> !
> ! Last configuration change at 13:43:02 PST Sun Jan 5 2003
> ! NVRAM config last updated at 14:46:01 PST Sat Jan 4 2003
> !
> version 12.2
> service timestamps debug datetime msec localtime show-timezone
> service timestamps log datetime msec localtime show-timezone
> no service password-encryption
> !
> hostname c1751
> !
> !
> clock timezone PST -8
> clock summer-time PDT recurring
> ip subnet-zero
> !
> !
> ip tcp synwait-time 5
> no ip domain lookup
> !
> !
> !
> !
> !
> interface FastEthernet0/0
> description To the backbone top switch 2901
> ip address 192.168.1.202 255.255.255.0
> speed auto
> !
> interface Serial0/0
> no ip address
> shutdown
> !
> interface Serial0/1
> no ip address
> encapsulation frame-relay
> frame-relay lmi-type ansi
> !
> interface Serial0/1.10 multipoint
> ip address 172.16.2.2 255.255.255.0
> ip ospf priority 255
> frame-relay map ip 172.16.2.5 205
> frame-relay map ip 172.16.2.7 207
> no frame-relay inverse-arp
> !
> interface Serial1/0
> ip address 192.168.10.2 255.255.255.252
> !
> router ospf 10
> router-id 10.254.2.2
> log-adjacency-changes
> network 172.16.0.0 0.0.255.255 area 1
> neighbor 172.16.2.5
> neighbor 172.16.2.7
> !
> ip classless
> ip route 0.0.0.0 0.0.0.0 192.168.1.1
> no ip http server
> !
> !
> !
> alias exec b sh ip bgp
> alias exec c conf t
> alias exec co clea ip ospf proc
> alias exec cr clea ip rout *
> alias exec i sho ip interf brief
> alias exec o sho ip ospf
> alias exec pr sh ip prot
> alias exec r show ip rout
> alias exec s show run
> alias exec sb show run | begin
> alias exec w write mem
> !
> line con 0
> exec-timeout 0 0
> privilege level 15
> logging synchronous
> line aux 0
> line vty 0 4
> exec-timeout 0 0
> password 123456
> logging synchronous
> login
> !
> no scheduler allocate
> sntp server 136.159.2.1
> end
>
> c1751#sh ip ospf interface
> Serial0/1.10 is up, line protocol is up
> Internet Address 172.16.2.2/24, Area 1
> Process ID 10, Router ID 10.254.2.2, Network Type NON_BROADCAST, Cost:
> 64
> Transmit Delay is 1 sec, State DR, Priority 255
> Designated Router (ID) 10.254.2.2, Interface address 172.16.2.2
> No backup designated router on this network
> Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
> Hello due in 00:00:18
> Index 1/1, flood queue length 0
> Next 0x0(0)/0x0(0)
> Last flood scan length is 2, maximum is 2
> Last flood scan time is 0 msec, maximum is 0 msec
> Neighbor Count is 2, Adjacent neighbor count is 2
> Adjacent with neighbor 10.5.5.5
> Adjacent with neighbor 10.7.7.7
> Suppress hello for 0 neighbor(s)
> c1751#
> c1751#sh ip ospf neighbor
>
> Neighbor ID Pri State Dead Time Address
> Interface
> 10.5.5.5 0 FULL/DROTHER 00:01:52 172.16.2.5
> Serial0/1.10
> 10.7.7.7 0 FULL/DROTHER 00:01:53 172.16.2.7
> Serial0/1.10
> c1751#
>
>
>
> Spoke 1
> =-=-=-=-=
>
> c1602r#sh run
> Building configuration...
>
> Current configuration : 1523 bytes
> !
> ! Last configuration change at 15:45:25 PST Sat Jan 4 2003
> ! NVRAM config last updated at 15:15:48 PST Sat Jan 4 2003
> !
> version 12.1
> no service single-slot-reload-enable
> service timestamps debug datetime localtime show-timezone
> service timestamps log datetime localtime show-timezone
> no service password-encryption
> !
> hostname c1602r
> !
> boot system tftp c1600-sy-mz.121-17-IP+.bin 192.168.1.100
> !
> !
> !
> !
> !
> clock timezone PST -8
> clock summer-time PDT recurring
> ip subnet-zero
> !
> !
> !
> !
> interface Loopback10
> ip address 7.7.7.7 255.255.255.0
> !
> interface Loopback11
> ip address 7.77.7.7 255.255.255.0
> !
> interface Ethernet0
> ip address 192.168.1.207 255.255.255.0
> !
> interface Serial0
> ip address 172.16.2.7 255.255.255.0
> encapsulation frame-relay
> ip ospf priority 0
> no fair-queue
> service-module 56k clock source line
> service-module 56k network-type dds
> frame-relay map ip 172.16.2.2 702
> frame-relay map ip 172.16.5.5 702
> no frame-relay inverse-arp
> !
> router ospf 10
> router-id 10.7.7.7
> log-adjacency-changes
> network 172.16.0.0 0.0.255.255 area 1
> !
> no ip classless
> no ip http server
> !
> alias exec b sh ip bgp
> alias exec c conf t
> alias exec co cle ip ospf proc
> alias exec cr cle ip rout *
> alias exec i sh ip int brief
> alias exec pr sh ip protocols
> alias exec o sh ip ospf
> alias exec r sh ip rout
> alias exec s sh run
> alias exec sb sh run | begin
> alias exec w wr mem
> !
> line con 0
> exec-timeout 0 0
> logging synchronous
> line vty 0 4
> exec-timeout 0 0
> password 123456
> logging synchronous
> login
> !
> sntp server 136.159.2.1
> end
>
> c1602
>
> c1602r#
> c1602r#
> c1602r#sho ip ospf interface
> Serial0 is up, line protocol is up
> Internet Address 172.16.2.7/24, Area 1
> Process ID 10, Router ID 10.7.7.7, Network Type NON_BROADCAST, Cost: 64
> Transmit Delay is 1 sec, State DROTHER, Priority 0
> Designated Router (ID) 10.254.2.2, Interface address 172.16.2.2
> No backup designated router on this network
> Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
> Hello due in 00:00:13
> Index 1/1, flood queue length 0
> Next 0x0(0)/0x0(0)
> Last flood scan length is 1, maximum is 1
> Last flood scan time is 0 msec, maximum is 4 msec
> Neighbor Count is 1, Adjacent neighbor count is 1
> Adjacent with neighbor 10.254.2.2 (Designated Router)
> Suppress hello for 0 neighbor(s)
> c1602r#
> c1602r#
> c1602r#show ip ospf neighbor
>
> Neighbor ID Pri State Dead Time Address
> Interface
> 10.254.2.2 255 FULL/DR 00:01:52 172.16.2.2 Serial0
> c1602r#
> c1602r#
> c1602r#
>
> Spoke 2
> =-=-=-=-
> c2505#sh run
> Building configuration...
>
> Current configuration : 1778 bytes
> !
> ! Last configuration change at 13:54:25 PST Sun Jan 5 2003
> !
> version 12.1
> no service single-slot-reload-enable
> service timestamps debug datetime msec localtime show-timezone
> service timestamps log datetime msec localtime show-timezone
> no service password-encryption
> !
> hostname c2505
> !
> !
> !
> !
> !
> !
> clock timezone PST -8
> clock summer-time PDT recurring
> ip subnet-zero
> ip tcp synwait-time 5
> no ip domain-lookup
> !
> !
> !
> !
> hub ether 0 1
> link-test
> auto-polarity
> !
> hub ether 0 2
> link-test
> auto-polarity
> !
> hub ether 0 3
> link-test
> auto-polarity
> !
> hub ether 0 4
> link-test
> auto-polarity
> !
> hub ether 0 5
> link-test
> auto-polarity
> !
> hub ether 0 6
> link-test
> auto-polarity
> !
> hub ether 0 7
> link-test
> auto-polarity
> !
> hub ether 0 8
> link-test
> auto-polarity
> !
> interface Ethernet0
> description To the backbone top switch 2901
> ip address 192.168.1.205 255.255.255.0
> !
> interface Serial0
> no ip address
> shutdown
> !
> interface Serial1
> ip address 172.16.2.5 255.255.255.0
> encapsulation frame-relay
> ip ospf priority 0
> frame-relay map ip 172.16.2.2 502
> frame-relay map ip 172.16.7.7 502
> no frame-relay inverse-arp
> !
> router ospf 10
> router-id 10.5.5.5
> log-adjacency-changes
> network 172.16.0.0 0.0.255.255 area 1
> !
> ip classless
> ip route 0.0.0.0 0.0.0.0 192.168.1.1
> ip http server
> !
> !
> alias exec b sh ip bgp
> alias exec c conf t
> alias exec co clea ip ospf proc
> alias exec cr clea ip rout *
> alias exec i sho ip interf brief
> alias exec o sho ip ospf
> alias exec pr sh ip prot
> alias exec r show ip rout
> alias exec s show run
> alias exec sb show run | begin
> alias exec w write mem
> !
> line con 0
> exec-timeout 0 0
> privilege level 15
> logging synchronous
> line aux 0
> line vty 0 4
> exec-timeout 0 0
> password 123456
> logging synchronous
> login
> !
> ntp clock-period 17180086
> ntp server 136.159.2.1
> end
>
> c2505#sh ip ospf interface
> Serial1 is up, line protocol is up
> Internet Address 172.16.2.5/24, Area 1
> Process ID 10, Router ID 10.5.5.5, Network Type NON_BROADCAST, Cost: 64
> Transmit Delay is 1 sec, State DROTHER, Priority 0
> Designated Router (ID) 10.254.2.2, Interface address 172.16.2.2
> No backup designated router on this network
> Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
> Hello due in 00:00:08
> Index 1/1, flood queue length 0
> Next 0x0(0)/0x0(0)
> Last flood scan length is 1, maximum is 1
> Last flood scan time is 0 msec, maximum is 0 msec
> Neighbor Count is 1, Adjacent neighbor count is 1
> Adjacent with neighbor 10.254.2.2 (Designated Router)
> Suppress hello for 0 neighbor(s)
> c2505#
> c2505#
> c2505#sh ip ospf neighbor
>
> Neighbor ID Pri State Dead Time Address
> Interface
> 10.254.2.2 255 FULL/DR 00:01:48 172.16.2.2 Serial1
> c2505#
>
>
>
>
> MY> However Solution 2 will work if you change the ospf network type
> MY> point-to-multipoint and specify the keyword broadcast on spokes as
> well.
>
> MY> Out of sol. 1 and the ammended sol. 2 I would use use sol. 1 if extra
> frame
> MY> maps are permitted on spokes .Reason being is that with sol.
> additional
> MY> host routes are generated as well which need to be controlled.
>
> MY> (The below might not be exact but I remember that a host route was
> keeping
> MY> the ISDN link up)
> MY> I saw an issue in Lab 17 ccbootcamp where the hub was redistributing
> OSPF
> MY> into ISIS and the main network got redistributed as well as host
> routes for
> MY> spoke so the ISIS router with ISDN backup did not have the host route
> for
> MY> the hub itself and the other end of the ISDN link had OSPF learnt
> routes so
> MY> was learning the hosts routes for hub and spokes and this additional
> host
> MY> route for hub was keeping the ISDN link up.
>
> MY> HTH
>
> MY> Yasser
>
>
> >> -----Original Message-----
> >> From: syv [SMTP:syv@911networks.com]
> >> Sent: Saturday, January 04, 2003 11:42 PM
> >> To: ccielab@groupstudy.com
> >> Subject: Frame-relay & OSPF: 1/2 dozen or 6
> >>
> >> I have the basic frame-relay / OPSF
> >>
> >> R1
> >> / \
> >> R2 R3
> >>
> >> R1: Hub, DR, point-to-multipoint subinterface
> >> R2 & R3: Spokes, physical interfaces
> >>
> >> Which is the "better-way" configure for the frame-relay and
> >> the DR?
> >>
> >> No broadcast with neighbors or Broadcast without neighbors
> >>
> >> Alternative 1:
> >> =-=-=-=-=-=-=-
> >> Hub:
> >> interface Serial0/1
> >> no ip address
> >> encapsulation frame-relay
> >> frame-relay lmi-type ansi
> >> !
> >> interface Serial0/1.10 multipoint
> >> ip address 172.16.2.2 255.255.0.0
> >> ip ospf priority 255
> >> frame-relay map ip 172.16.5.5 205 ! no broadcasts, use neighbors
> >> frame-relay map ip 172.16.7.7 207
> >> no frame-relay inverse-arp
> >> !
> >> router ospf 10
> >> router-id 10.254.2.2
> >> network 172.16.0.0 0.0.255.255 area 1
> >> neighbor 172.16.5.5
> >> neighbor 172.16.7.7
> >> !
> >> !
> >> Spoke:
> >> !
> >> interface Serial1
> >> ip address 172.16.5.5 255.255.0.0
> >> encapsulation frame-relay
> >> ip ospf priority 0
> >> frame-relay map ip 172.16.2.2 502
> >> frame-relay map ip 172.16.7.7 502
> >> no frame-relay inverse-arp
> >> !
> >> router ospf 10
> >> router-id 10.5.5.5
> >> log-adjacency-changes
> >> network 172.16.0.0 0.0.255.255 area 1
> >> !
> >> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> >> Alternative 2:
> >> =-=-=-=-=-=-=-
> >>
> >> Hub:
> >> interface Serial0/1
> >> no ip address
> >> encapsulation frame-relay
> >> frame-relay lmi-type ansi
> >> !
> >> interface Serial0/1.10 multipoint
> >> ip address 172.16.2.2 255.255.0.0
> >> ip ospf priority 255
> >> frame-relay map ip 172.16.5.5 205 broadcast
> >> frame-relay map ip 172.16.7.7 207 broadcast
> >> no frame-relay inverse-arp
> >> !
> >> router ospf 10
> >> router-id 10.254.2.2
> >> network 172.16.0.0 0.0.255.255 area 1
> >> !
> >>
> >> Spokes stay the same
>
>
> --
> Thanks
> syv@911networks.com
.
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