T1 Bandwidth?

Discussion in 'Cisco' started by Tom Linden, Nov 5, 2007.

  1. Tom Linden

    Tom Linden Guest

    I have a T1 CSU/DSU on a 2621 router and looking at the line

    CISCO2#sho int s0/0
    Serial0/0 is up, line protocol is up
    Hardware is PQUICC with Fractional T1 CSU/DSU
    Internet address is xxx.xxx.xxx.xxx/30
    MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
    reliability 255/255, txload 1/255, rxload 1/255
    Encapsulation HDLC, loopback not set
    Keepalive set (10 sec)
    Last input 00:00:00, output 00:00:00, output hang never
    Last clearing of "show interface" counters 2d03h
    Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
    Queueing strategy: weighted fair
    Output queue: 0/1000/64/0 (size/max total/threshold/drops)
    Conversations 0/6/256 (active/max active/max total)
    Reserved Conversations 0/0 (allocated/max allocated)
    Available Bandwidth 1158 kilobits/sec
    5 minute input rate 1000 bits/sec, 2 packets/sec
    5 minute output rate 2000 bits/sec, 2 packets/sec

    Why is the Available Bandwidth on the Output queue less than the T1
    Bandwidth?
    Can it be increased?


    --
    PL/I for OpenVMS
    www.kednos.com
     
    Tom Linden, Nov 5, 2007
    #1
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  2. Tom Linden

    Zub Guest

    On Nov 5, 4:05 pm, "Tom Linden" <> wrote:
    > I have a T1 CSU/DSU on a 2621 router and looking at the line
    >
    > CISCO2#sho int s0/0
    > Serial0/0 is up, line protocol is up
    > Hardware is PQUICC with Fractional T1 CSU/DSU
    > Internet address is xxx.xxx.xxx.xxx/30
    > MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
    > reliability 255/255, txload 1/255, rxload 1/255
    > Encapsulation HDLC, loopback not set
    > Keepalive set (10 sec)
    > Last input 00:00:00, output 00:00:00, output hang never
    > Last clearing of "show interface" counters 2d03h
    > Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
    > Queueing strategy: weighted fair
    > Output queue: 0/1000/64/0 (size/max total/threshold/drops)
    > Conversations 0/6/256 (active/max active/max total)
    > Reserved Conversations 0/0 (allocated/max allocated)
    > Available Bandwidth 1158 kilobits/sec
    > 5 minute input rate 1000 bits/sec, 2 packets/sec
    > 5 minute output rate 2000 bits/sec, 2 packets/sec
    >
    > Why is the Available Bandwidth on the Output queue less than the T1
    > Bandwidth?
    > Can it be increased?
    >
    > --
    > PL/I for OpenVMSwww.kednos.com


    What is the config for this interface? What are the sh controller
    commands displaying?
     
    Zub, Nov 5, 2007
    #2
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  3. Tom Linden

    Tom Linden Guest

    On Mon, 05 Nov 2007 08:10:58 -0800, Zub <> wrote:

    > On Nov 5, 4:05 pm, "Tom Linden" <> wrote:
    >> I have a T1 CSU/DSU on a 2621 router and looking at the line
    >>
    >> CISCO2#sho int s0/0
    >> Serial0/0 is up, line protocol is up
    >> Hardware is PQUICC with Fractional T1 CSU/DSU
    >> Internet address is xxx.xxx.xxx.xxx/30
    >> MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
    >> reliability 255/255, txload 1/255, rxload 1/255
    >> Encapsulation HDLC, loopback not set
    >> Keepalive set (10 sec)
    >> Last input 00:00:00, output 00:00:00, output hang never
    >> Last clearing of "show interface" counters 2d03h
    >> Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
    >> Queueing strategy: weighted fair
    >> Output queue: 0/1000/64/0 (size/max total/threshold/drops)
    >> Conversations 0/6/256 (active/max active/max total)
    >> Reserved Conversations 0/0 (allocated/max allocated)
    >> Available Bandwidth 1158 kilobits/sec
    >> 5 minute input rate 1000 bits/sec, 2 packets/sec
    >> 5 minute output rate 2000 bits/sec, 2 packets/sec
    >>
    >> Why is the Available Bandwidth on the Output queue less than the T1
    >> Bandwidth?
    >> Can it be increased?
    >>
    >> --
    >> PL/I for OpenVMSwww.kednos.com

    >
    > What is the config for this interface? What are the sh controller
    > commands displaying?
    >

    Here is the config
    interface Serial0/0
    ip address 206.XXX.XXX.XXX 255.255.255.252
    ip access-group 101 in
    ip access-group 102 out
    ip nat outside
    no ip mroute-cache

    CISCO2#sho controllers F0/0
    Interface FastEthernet0/0
    Hardware is AMD Am79c971
    ADDR: 82BF5BD8, FASTSEND: 80027A1C, MCI_INDEX: 0
    DIST ROUTE ENABLED: 0
    Route Cache Flag: 11
    LADRF=0x0000 0x0000 0x0000 0x0000
    CSR0 =0x00000072, CSR3 =0x00001044, CSR4 =0x0000491D, CSR15 =0x00000180
    CSR80 =0x00009900, CSR114=0x00000000, CRDA =0x03D177E0, CXDA =0x03D17B10
    BCR9 =0x00000001 (full-duplex)
    CSR5 =0x00000001, CSR7 =0x00000828, CSR100=0x0000F000, CSR125=0x00005C3C
    BCR2 =0x00001000, BCR9 =0x00000001, BCR18 =0x000019E0, BCR22 =0x0000FF06
    BCR25 =0x000000FF, BCR26 =0x00000080, BCR27 =0x00000010, BCR32 =0x00004D80
    HW filtering information:
    Promiscuous Mode Disabled, PHY Addr Enabled, Broadcast Addr Enabled
    PHY Addr=00B0.64AD.7900, Multicast Filter=0x0000 0x0000 0x0000 0x0000
    amdp2_instance=0x82BF7380, registers=0x40000000, ib=0x3D17540
    rx ring entries=64, tx ring entries=128
    rxring=0x3D175A0, rxr shadow=0x82BF75F0, rx_head=36, rx_tail=0
    txring=0x3D179E0, txr shadow=0x82BF771C, tx_head=19, tx_tail=19,
    tx_count=0
    Software MAC address filter(hash:length/addr/mask/hits):
    spurious_idon=0, throttled=0, enabled=0, disabled=0
    rx_framing_err=0, rx_overflow_err=0, rx_buffer_err=0
    rx_bpe_err=0, rx_soft_overflow_err=0, rx_no_enp=0, rx_discard=0
    tx_one_col_err=0, tx_more_col_err=0, tx_no_enp=0, tx_deferred_err=0
    tx_underrun_err=0, tx_late_collision_err=0, tx_loss_carrier_err=0
    tx_exc_collision_err=0, tx_buff_err=0, fatal_tx_err=0
    hsrp_conf=0, need_af_check=0
    tx_limited=0(64)
    PHY registers:
    Register 0x00: 1100 782D 7810 0003 0141 01E1 0001 0000
    Register 0x08: 0000 0000 0000 0000 0000 0000 0000 0000
    Register 0x10: 0000 0000 4000 0000 38C8 0010 0000 0002
    Register 0x18: 0001 0000 0000 0000 0000

    CISCO2#sho controllers F0/1
    Interface FastEthernet0/1
    Hardware is AMD Am79c971
    ADDR: 82BFB858, FASTSEND: 80027A1C, MCI_INDEX: 0
    DIST ROUTE ENABLED: 0
    Route Cache Flag: 11
    LADRF=0x0000 0x0100 0x0000 0x0000
    CSR0 =0x00000072, CSR3 =0x00001044, CSR4 =0x0000491D, CSR15 =0x00000180
    CSR80 =0x00009900, CSR114=0x00000000, CRDA =0x03D665C0, CXDA =0x03D66BF0
    BCR9 =0x00000001
    CSR5 =0x00000001, CSR7 =0x00000028, CSR100=0x0000F000, CSR125=0x00005C3C
    BCR2 =0x00001000, BCR9 =0x00000001, BCR18 =0x000019E0, BCR22 =0x0000FF06
    BCR25 =0x000000FF, BCR26 =0x00000080, BCR27 =0x00000010, BCR32 =0x00004D80
    HW filtering information:
    Promiscuous Mode Disabled, PHY Addr Enabled, Broadcast Addr Enabled
    PHY Addr=00B0.64AD.7901, Multicast Filter=0x0000 0x0100 0x0000 0x0000
    amdp2_instance=0x82BFD000, registers=0x40100000, ib=0x3D66260
    rx ring entries=64, tx ring entries=128
    rxring=0x3D662C0, rxr shadow=0x82BFD270, rx_head=48, rx_tail=0
    txring=0x3D66700, txr shadow=0x82BFD39C, tx_head=79, tx_tail=79,
    tx_count=0
    Software MAC address filter(hash:length/addr/mask/hits):
    0xC0: 0 0100.0ccc.cccc 0000.0000.0000 0
    spurious_idon=0, throttled=0, enabled=0, disabled=0
    rx_framing_err=0, rx_overflow_err=0, rx_buffer_err=0
    rx_bpe_err=0, rx_soft_overflow_err=0, rx_no_enp=0, rx_discard=0

    CISCO2#sho controllers S0/0
    Interface Serial0/0
    Hardware is PowerQUICC MPC860 with Integrated FT1 CSU/DSU module
    TX and RX clocks detected.
    idb at 0x82C01F10, driver data structure at 0x82C09CA4
    SCC Registers:
    General [GSMR]=0x2:0x00000030, Protocol-specific [PSMR]=0x8
    Events [SCCE]=0x0000, Mask [SCCM]=0x001F, Status [SCCS]=0x06
    Transmit on Demand [TODR]=0x0, Data Sync [DSR]=0x7E7E
    Interrupt Registers:
    Config [CICR]=0x00367F80, Pending [CIPR]=0x00008000
    Mask [CIMR]=0x40204000, In-srv [CISR]=0x00000000
    Command register [CR]=0x600
    Port A [PADIR]=0x0000, [PAPAR]=0xFFFF
    [PAODR]=0x0000, [PADAT]=0xEEFF
    Port B [PBDIR]=0x0180F, [PBPAR]=0x0000E
    [PBODR]=0x00000, [PBDAT]=0x3E77D
    Port C [PCDIR]=0x00C, [PCPAR]=0x000
    [PCSO]=0x020, [PCDAT]=0xFC0, [PCINT]=0x00F
    Receive Ring
    rmd(680126B0): status 9000 length 2E address 3DB7044
    rmd(680126B8): status 9000 length 86 address 3DB76C4
    rmd(680126C0): status 9000 length 2E address 3DBAAC4
    rmd(680126C8): status 9000 length 86 address 3DB9744

    CISCO2#sho controllers T1

    CISCO2#


    --
    PL/I for OpenVMS
    www.kednos.com
     
    Tom Linden, Nov 5, 2007
    #3
  4. "Tom Linden" <> ha scritto nel messaggio
    news:eek:...
    >I have a T1 CSU/DSU on a 2621 router and looking at the line
    >
    > CISCO2#sho int s0/0
    > Serial0/0 is up, line protocol is up
    > Hardware is PQUICC with Fractional T1 CSU/DSU
    > Internet address is xxx.xxx.xxx.xxx/30
    > MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
    > reliability 255/255, txload 1/255, rxload 1/255
    > Encapsulation HDLC, loopback not set
    > Keepalive set (10 sec)
    > Last input 00:00:00, output 00:00:00, output hang never
    > Last clearing of "show interface" counters 2d03h
    > Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
    > Queueing strategy: weighted fair
    > Output queue: 0/1000/64/0 (size/max total/threshold/drops)
    > Conversations 0/6/256 (active/max active/max total)
    > Reserved Conversations 0/0 (allocated/max allocated)
    > Available Bandwidth 1158 kilobits/sec
    > 5 minute input rate 1000 bits/sec, 2 packets/sec
    > 5 minute output rate 2000 bits/sec, 2 packets/sec
    >
    > Why is the Available Bandwidth on the Output queue less than the T1
    > Bandwidth?
    > Can it be increased?
    >
    >
    > --
    > PL/I for OpenVMS
    > www.kednos.com


    Hi,

    You don't have to worry about that value (unless you want to tune this for
    QoS implmenetation).
    A 25% of "bandwidth" is reserved in such a way that you can't allocate it to
    RSVP, other QoS features (i.e. Class bandwidth/priority).
    This is a safeguard for traffic overhead and routing protocol traffic not to
    be starved if you "reserved" the 100% bandwidth to user traffic.
    Note that now you can already use your whole "pipe", you are not limited to
    1158Kbps

    You can tune the value using "max-reserved-bandwidth" interface command

    Probably I haven't expressed myself well, so you should see some real
    documentation about this.

    Regards,
    Gabriele
     
    Gabriele Beltrame, Nov 5, 2007
    #4
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