Oi Jacques,
Em um roteador cisco 2501, uma interface com encapsulamento
frame-relay pode ser configurada 60 sub-interfaces, supondo que
cada sub-interface possua um dlci.
Segue duas documenta��es para voce ler.
Grato.
DLCI Limitations
Subinterfaces count toward the practical upper limit of 230 Interface
Descriptor Blocks (IDBs). In other words, Cisco IOS currently doesn't
support more then 230 interfaces on the router (real or virtual) unless you
have an ISP Geeks Image which has 1024 IDBs. How many DLCIs can one
configure per physical interface? How many DLCIs can one configure in a
specific router? These two questions are frequently asked. Disappointingly,
the answer is, "it depends."
DLCI address space: Approximately 1000 DLCIs can be configured on a single
physical link, given a 10-bit address. Because certain DLCIs are reserved
(vendor-implementation-dependent), the maximum is about 1000. The range for
"cisco" LMI is 16-1007. The stated range for ANSI/ITU is 16-992. These are
the DLCIs carrying user-data.
LMI status update: The LMI protocol requires that all permanent virtual
circuit (PVC) status reports fit into a single packet and generally limits
the number of DLCIs to less than 800, depending on the maximum transmission
unit (MTU) size.
Default MTU on serial interfaces is 1500 bytes, yielding a maximum of 296
DLCIs per interface. Please note that these numbers vary slightly, depending
on the LMI type. The maximum DLCIs per router (not interface) platform
guideline, based on extrapolation from empirical data established on a Cisco
7000 router platform, are listed below:
a.. Cisco 2500: 1 X T1/E1 link @ 60 DLCIs per interface = 60 total
b.. Cisco 4000: 1 X T1/E1 link @ 120 DLCIs per interface = 120 total
c.. Cisco 4500: 3 X T1/E1 links @ 120 DLCIs per interface = 360 total
d.. Cisco 4700: 4 X T1/E1 links @ 120 DLCIs per interface = 480 total
e.. Cisco 7000: 4 X T1/E1/T3/E3 links @ 120 DLCIs per interface = 480
total
f.. Cisco 7200: 5 X T1/E1/T3/E3 links @ 120 DLCIs per interface = 600
total
g.. Cisco 7500: 6 X T1/E1/T3/E3 links @ 120 DLCIs per interface = 720
total
Note: These numbers are guidelines only, and assume that all traffic is
fast-switched.
interface
To configure an interface type and enter interface configuration mode, use
the interface global configuration command.
interface type number [name-tag]
Cisco 7200 Series and Cisco 7500 Series with a Packet over SONET Interface
Processor
interface type slot/port
Cisco 7500 Series with Ports on VIP Cards
interface type slot/port-adapter/port [ethernet | serial]
Cisco 7500 Series with Channelized T1 or E1
interface serial slot/port:channel-group
Cisco 4000 Series with Channelized T1 or E1 and the Cisco MC3810
interface serial number:channel-group
To configure a subinterface, use this form of the interface global
configuration commands:
Cisco 7500 Series with Ports on VIP Cards
interface type slot/port-adapter/port.subinterface-number [multipoint |
point-to-point]
Cisco 7200 Series
interface type slot/port.subinterface-number [multipoint | point-to-point]
Cisco 7500 Series
interface type slot/port-adapter.subinterface-number [multipoint |
point-to-point]
Syntax Description type
Type of interface to be configured. See Table 12.
number
Port, connector, or interface card number. On a Cisco 4000 series
router, specifies the NPM number. The numbers are assigned at the factory at
the time of installation or when added to a system, and can be displayed
with the show interfaces command.
name-tag
(Optional) Specifies the logic name to identify the server
configuration so that multiple entries of server configuration can be
entered.
This optional argument is for use with the RLM feature.
slot
Number of the slot being configured. Refer to the appropriate hardware
manual for slot and port information.
port
Number of the port being configured. Refer to the appropriate hardware
manual for slot and port information.
port-adapter
Number of the port-adapter being configured. Refer to the appropriate
hardware manual for information about port adapter compatibility.
ethernet
Ethernet IEEE 802.3 interface.
serial
Serial interface.
:channel-group
Cisco 4000 series routers specify the T1 channel group number in the
range of 0 to 23 defined with the channel-group controller configuration
command. On a dual port card, it is possible to run channelized on one port
and primary rate on the other port.
Cisco MC3810 specifies the T1/E1 channel group number in the range of
0 to 23 defined with the channel-group controller configuration command.
.subinterface-number
Subinterface number in the range 1 to 4294967293. The number that
precedes the period (.) must match the number to which this subinterface
belongs.
multipoint | point-to-point
(Optional) Specifies a multipoint or point-to-point subinterface. There
is no default.
Kevison Dennys Carrilho Bentes
Gerente de Rede
Air System Network
Bras�lia - DF Brasil
Fone: 55 61 313-8002
Fax: 55 61 313-8008
[EMAIL PROTECTED]
----- Original Message -----
From: "Jacques Chicourel Nunes Vaz" <[EMAIL PROTECTED]>
To: "Lista de Discuss�o Rede Wan" <[EMAIL PROTECTED]>
Sent: Tuesday, October 03, 2000 9:42 AM
Subject: [redewan] Frame Relay Cisco
> Lista de Discuss�o Rede Wan - http://www.networkdesigners.com.br
>
> Pessoal,
>
>
> Gostaria de saber quantas "sub seriais" ( se e que este e o termo !)
podem
> ser configuradas em um cisco 2501 para um link frame-relay, ou seja
> quantas localidades podemos atender com apenas uma serial ?
>
> Jacques
>
>
> ______________________________________________________________________
>
>
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