From: John Howell (jhowell@xxxxxxxxxxxx)
Date: Mon May 17 1999 - 18:38:09 GMT-3
Title: OSPF Trivia
Here is a snip from the command reference and inverse-arp has nothing
to do with DLCI assignment. You can run OSPF in NON_BROADCAST or
POINT_TO_MULTIPOINT over a frame mulitpoint. Can you send me a "show
frame pvc"' for me.
frame-relay interface-dlci
To assign a data link connection identifier (DLCI) to a specified
Frame Relay subinterface on the router or access server, use the
frame-relay interface-dlci interface configuration command. Use the no
form of this command to remove this assignment.
frame-relay interface-dlci dlci [ietf | cisco] [voice-encap size]
[voice-cir cir]
no frame-relay interface-dlci dlci [ietf | cisco] [voice-encap size]
[voice-cir cir]
Syntax Description
CAPTION:
dlci
DLCI number to be used on the specified subinterface.
ietf | cisco
(Optional) Encapsulation type: Internet Engineering Task Force (IETF)
Frame Relay encapsulation or Cisco Frame Relay encapsulation.
voice-encap size
(Optional; supported on the Cisco MC3810 only.) Specifies that data
fragmentation will be used to support Voice over Frame Relay. The
voice encapsulation size denotes the data fragmentation size. The
valid range is from 80 to 1600 bytes.
For a list of recommended data fragmentation sizes and an important
note regarding the voice-encap option, see the "Usage Guidelines"
section.
voice-cir cir
(Optional; supported on the Cisco MC3810 only.) Specifies the upper
limit on the voice bandwidth that may be reserved for this DLCI. The
default is the CIR configured for the Frame Relay map class. For more
information, see the "Usage Guidelines" section.
Default
No DLCI is assigned.
Thanks,
John T. Howell
Cohesive Technology Solutions
Senior Consultant/Engineer
CCNP/CCDP, MCSE+I, MCNE
225-751-6100
225-751-6200 (fax)
-----Original Message-----
From: Mark, Detrick [mailto:mdetrick@cisco.com]
Sent: Monday, May 17, 1999 4:27 PM
To: John Howell
Cc: GroupStudy (E-mail)
Subject: Re: OSPF Trivia
Not true. I never use interface-dlci commands on my multipoint
interfaces. Inverse-arp will take care of it, which is on by default.
For OSPF you must use the IP OSPF NETWORK POINT-TO-MULTIPOINT
command. I did a sh ru for you below of a router that is acting as a
FR hub, int s0.2. Proper configuration is to have the remote routers
also configured as multipoint and also using the OSPF command. All
multipoint subinterfaces should use map and not interface-dlci.
Current configuration:
!
version 11.2
no service password-encryption
no service udp-small-servers
no service tcp-small-servers
!
hostname tiger
!
!
ip subnet-zero
no ip domain-lookup
clns routing
!
interface Loopback0
ip address 1.1.1.4 255.255.255.255
!
interface Ethernet0
ip address 100.1.0.1 255.255.255.252
!
interface Serial0
no ip address
encapsulation frame-relay
bandwidth 2000
!
interface Serial0.1 point-to-point
ip address 11.0.1.1 255.255.255.252
bandwidth 2000
frame-relay interface-dlci 107
!
interface Serial0.2 multipoint
ip address 10.0.0.1 255.255.255.0
ip ospf network point-to-multipoint
bandwidth 2000
frame-relay map ip 10.0.0.2 127 broadcast
frame-relay map ip 10.0.0.3 147 broadcast
!
interface Serial1
ip address 100.0.0.1 255.255.255.252
ip router isis
clockrate 2000000
!
interface BRI0
no ip address
shutdown
!
router eigrp 1
network 100.0.0.0
!
router ospf 1
network 10.0.0.0 0.0.0.255 area 5
network 1.1.1.4 0.0.0.0 area 5
network 11.0.1.0 0.0.0.3 area 13
area 5 virtual-link 1.1.1.1
area 5 virtual-link 1.1.1.2
area 13 stub no-summary
!
router isis
redistribute ospf 1 metric 32 metric-type internal level-2
default-information originate
net 49.0001.0000.0000.000a.00
!
router bgp 200
no synchronization
network 100.0.0.0 mask 255.255.255.252
network 1.1.1.5 mask 255.255.255.255
network 101.8.0.0 mask 255.248.0.0
neighbor 10.0.0.2 remote-as 100
neighbor 10.0.0.3 remote-as 100
neighbor 100.1.0.2 remote-as 200
no auto-summary
!
ip classless
!
!
line con 0
exec-timeout 0 0
line aux 0
line vty 0 4
login
!
end
Mark Detrick
DSL Business Unit
Cisco Systems
2569 McCabe Way
Irvine, CA 92614
----- Original Message -----
From: John Howell
To: 'Mark, Detrick'
Sent: Monday, May 17, 1999 1:54 PM
Subject: RE: OSPF Trivia
Look up the command frame interface DLCI. That commands associates as
DLCI with a sub interface. By default all DLCI's are assignee to the
physical interface. You have to have that command.
Thanks,
John T. Howell
Cohesive Technology Solutions
Senior Consultant/Engineer
CCNP/CCDP, MCSE+I, MCNE
225-751-6100
225-751-6200 (fax)
-----Original Message-----
From: Mark, Detrick [mailto:mdetrick@cisco.com]
Sent: Monday, May 17, 1999 3:43 PM
To: John Howell; GroupStudy (E-mail)
Subject: Re: OSPF Trivia
Your multipoint interface needs to use maps and not interface-dlci
statements.
Mark Detrick
DSL Business Unit
Cisco Systems
2569 McCabe Way
Irvine, CA 92614
----- Original Message -----
From: John Howell
To: GroupStudy (E-mail)
Sent: Monday, May 17, 1999 1:21 PM
Subject: OSPF Trivia
I thought that I would change the subject since we have beat IPX to
death. Below is a setup for a multipoint Frame network. Why does
router R2 loose all OSPF routes when the PVC to R6 comes up? Why
does R3 and R6 maintain routes from OSPF?
R6 (hub)
interface Serial0
no ip address
encapsulation frame-relay
!
interface Serial0.1 multipoint
ip address 170.100.2.1 255.255.255.0
frame-relay interface-dlci 202
frame-relay interface-dlci 203
interface Ethernet0
ip address 170.100.70.1 255.255.255.0
router ospf 100
network 170.100.2.0 0.0.0.255 area 0
neighbor 170.100.2.3
neighbor 170.100.2.2
R2 (spoke)
interface Serial0
ip address 170.100.2.2 255.255.255.0
encapsulation frame-relay
frame-relay map ip 170.100.2.1 102 broadcast
interface Ethernet0
ip address 170.100.82.1 255.255.255.192
interface TokenRing0
ip address 170.100.81.1 255.255.255.0
router ospf 100
network 170.100.2.0 0.0.0.255 area 0
network 170.100.82.0 0.0.0.63 area 2
network 170.100.81.0 0.0.0.255 area 5
R3 (spoke)
interface Serial0
ip address 170.100.2.3 255.255.255.0
encapsulation frame-relay
frame-relay map ip 170.100.2.1 103 broadcast
interface Async1
ip address 170.100.90.1 255.255.255.248
encapsulation ppp
async default routing
async dynamic routing
async mode dedicated
interface Ethernet0
ip address 170.100.82.2 255.255.255.192
router ospf 100
network 170.100.2.0 0.0.0.255 area 0
network 170.100.82.0 0.0.0.63 area 2
network 170.100.90.0 0.0.0.7 area 3
area 3 virtual-link 170.100.101.1
Thanks,
John T. Howell
Cohesive Technology Solutions
Senior Consultant/Engineer
CCNP/CCDP, MCSE+I, MCNE
225-751-6100
225-751-6200 (fax)
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