2620 Bonded T1's (How to determine if bonded) 1

[mhuffenberger]

Help! My network guy is out of town and what my ISP is telling me doesn't make sense. We have a Cisco 2620 with two T1's. These are supposed to be bonded together--at least that's what we paid somebody to do about three years ago, with the ISP's assistance.

We had an issue earlier today with losing connectivity to a remote site. Called the ISP and the tech guy says we were trying to push more than 1.5Mb/s. I told him the T1's are bonded together. He says they aren't. That would explain the connection issues...

How can I determine if they are (their tech guys have been wrong on a number of occasions)? I have attached the results of a show interface command:

FastEthernet0/0 is up, line protocol is up
Hardware is AmdFE, address is 001c.31ec.88e0 (bia 001c.31ec.88e0)
Internet address is 99.129.196.97/27
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 3/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 8/75/44853/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 774000 bits/sec, 341 packets/sec
5 minute output rate 1382000 bits/sec, 329 packets/sec
2258226443 packets input, 3260030711 bytes
Received 504273 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
2260936910 packets output, 1589190378 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Serial0/0 is up, line protocol is up
Hardware is PQUICC with Fractional T1 CSU/DSU
Description: "Ckt ID 08/HCGS/000217/TWCS"
Internet address is 107.150.106.106/30
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 61/255, rxload 36/255
Encapsulation PPP, LCP Open
Open: IPCP, loopback not set
Last input 00:00:15, output 00:00:00, output hang never
Last clearing of "show interface" counters 1y22w
Input queue: 0/75/81/0 (size/max/drops/flushes); Total output drops: 137656
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 219000 bits/sec, 66 packets/sec
5 minute output rate 372000 bits/sec, 178 packets/sec
3298530929 packets input, 1160112388 bytes, 21 no buffer
Received 0 broadcasts, 0 runts, 3 giants, 0 throttles
112 input errors, 55 CRC, 51 frame, 0 overrun, 0 ignored, 3 abort
3283079666 packets output, 770106644 bytes, 0 underruns
0 output errors, 0 collisions, 23 interface resets
0 output buffer failures, 0 output buffers swapped out
9 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up

FastEthernet0/1 is administratively down, line protocol is down
Hardware is AmdFE, address is 001c.31ec.87e1 (bia 001c.31ec.87e1)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Auto-duplex, Auto Speed, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Serial0/1 is up, line protocol is up
Hardware is PQUICC with Fractional T1 CSU/DSU
Description: "Ckt ID 08/HCGS/000218/TWCS"
Internet address is 107.150.106.110/30
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 70/255, rxload 167/255
Encapsulation PPP, LCP Open
Open: IPCP, loopback not set
Last input 00:00:28, output 00:00:00, output hang never
Last clearing of "show interface" counters 1y22w
Input queue: 0/75/90/0 (size/max/drops/flushes); Total output drops: 136847
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 1017000 bits/sec, 297 packets/sec
5 minute output rate 424000 bits/sec, 194 packets/sec
3267111976 packets input, 913068293 bytes, 27 no buffer
Received 0 broadcasts, 0 runts, 3 giants, 0 throttles
124 input errors, 108 CRC, 13 frame, 0 overrun, 0 ignored, 0 abort
3283110941 packets output, 817208938 bytes, 0 underruns
0 output errors, 0 collisions, 23 interface resets
0 output buffer failures, 0 output buffers swapped out
9 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up

Loopback0 is up, line protocol is up
Hardware is Loopback
Internet address is 99.130.86.224/32
MTU 1514 bytes, BW 8000000 Kbit, DLY 5000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation LOOPBACK, loopback not set
Last input 40w6d, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/0 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
33 packets output, 2382 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out

 

[mhuffenberger]

Ok, it looks like I should have posted a show config. Here are the results:

boot system flash:c2600-i-mz.123-1a.bin
no logging console
!
ip subnet-zero
!
!
!
!
!
!
!
interface Loopback0
ip address 99.130.86.224 255.255.255.255
!
interface FastEthernet0/0
ip address 99.129.196.97 255.255.255.224
speed auto
full-duplex
!
interface Serial0/0
description "Ckt ID 08/HCGS/000217/TWCS"
ip address 107.150.106.106 255.255.255.252
no ip redirects
no ip proxy-arp
encapsulation ppp
no ip route-cache same-interface
no ip route-cache
no ip mroute-cache
no fair-queue
no cdp enable
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
!
interface Serial0/1
description "Ckt ID 08/HCGS/000218/TWCS"
ip address 107.150.106.110 255.255.255.252
no ip redirects
no ip proxy-arp
encapsulation ppp
no ip route-cache same-interface
no ip route-cache
no ip mroute-cache
no fair-queue
no cdp enable
!
router bgp 65110
no synchronization
bgp log-neighbor-changes
network 99.129.196.96 mask 255.255.255.224
neighbor 168.215.50.70 remote-as 4323
neighbor 168.215.50.70 description TW
neighbor 168.215.50.70 ebgp-multihop 2
neighbor 168.215.50.70 update-source Loopback0
neighbor 168.215.50.70 next-hop-self
neighbor 168.215.50.70 remove-private-AS
neighbor 168.215.50.70 soft-reconfiguration inbound
neighbor 168.215.50.70 distribute-list BGP_ADVERTISEMENT out
no auto-summary
!
no ip http server
ip classless
ip route 10.0.0.0 255.0.0.0 99.129.196.98
ip route 99.129.196.96 255.255.255.224 Null0 254
ip route 168.215.50.70 255.255.255.255 Serial0/0
ip route 168.215.50.70 255.255.255.255 Serial0/1
!
!
!
ip access-list extended BGP_ADVERTISEMENT
permit ip host 99.129.196.96 host 255.255.255.224
logging history size 250
logging history warnings
logging facility local5
logging 10.0.0.25
access-list 120 deny tcp host 10.17.1.8 host 207.68.171.233 eq www
!
line con 0
line aux 0
line vty 0 4
ip route 99.129.196.96 255.255.255.224 Null0 254
ip route 168.215.50.70 255.255.255.255 Serial0/0
ip route 168.215.50.70 255.255.255.255 Serial0/1
!
!
!
ip access-list extended BGP_ADVERTISEMENT
permit ip host 99.129.196.96 host 255.255.255.224
logging history size 250
logging history warnings
logging facility local5
logging 10.0.0.25
access-list 120 deny tcp host 10.17.1.8 host 207.68.171.233 eq www
!
line con 0
line aux 0
line vty 0 4
!
!
!
end

 

[plshlpme]

that is a fairly standard config

you peer to your isp on a single bgp session which is most likely a loopback interface on their side..

you then have two equal cost static routes going to that peer.. one through s0/0 and one through s0/1

so by default your router will do per destination load balancing over the two t1s.

now you will never get 3mb of traffic all in one shot.. but if you have many connections you will get 3mb throughput total..

understand what im saying? they wil load balance.. but they are not "bonded"

in order for that to work im pretty sure you need to add

ip cef

to your config...

 

[jasondvox]

Here --- sh ip interface brief

#sh ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 12.46.232.33 YES NVRAM up up
FastEthernet0/1 unassigned YES NVRAM up down
Serial0/2/0 unassigned YES NVRAM up up
Serial0/3/0 unassigned YES NVRAM up up
Multilink1 12.116.x.x YES NVRAM up up
dvox_2801#
See the Multilink!

Also if you download a "bandwidth monitor" that uses snmp you would be able to see what your multilink is doing.

 

[samsausagehead]

Help, Like many others I am attempting to do voip over serial interfaces. I need a way to Bond 3 t1's and reduce cpu utilization. I am using vrf Tunneling to reach my Satellites. Will Multilink ppp encap. work or will I have to use default cef.

Samsausagehead

controller T1 0/0/0
framing esf
linecode b8zs
channel-group 0 timeslots 1-24
description -wan Ser 1/0/1:0
!
controller T1 0/0/1
framing esf
linecode b8zs
channel-group 0 timeslots 1-24
description -wan T1 0/3/1
!
controller T1 0/1/0
framing esf
linecode b8zs
channel-group 0 timeslots 1-24
description -wan T1 1/0/1
!
controller T1 0/1/1
shutdown
framing esf
linecode b8zs
!
!
!
!
interface Tunnel19200168
ip vrf forwarding voip
ip address x.x.x.x 255.255.255.252
tunnel source Loopback0
tunnel destination x.x.x.x.
interface Loopback0
description VoIP
ip address x.x.x.x 255.255.255.255
!
interface FastEthernet0/0
no ip address
ip route-cache flow
duplex auto
speed auto
!
interface FastEthernet0/0.3848
description voip
encapsulation dot1Q 3848
ip vrf forwarding voip
ip address x.x.x.x 255.255.255.192
no snmp trap link-status
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0/0:0
description -wan ser1/0/1:0
ip unnumbered Loopback0
ip route-cache flow
!
interface Serial0/0/1:0
description -wan serial 2/1/0:0
ip unnumbered Loopback0
ip route-cache flow
!
interface Serial0/1/0:0
description -wan 0/3/1:0
ip unnumbered Loopback0
ip route-cache flow
!
router ospf 1112 vrf voip
log-adjacency-changes
area x.x.x.x stub
network x.x.x.x 0.0.0.3 area 0.0.0.0
network x.x.x.x 0.0.0.0 area x.x.x.x
!
router ospf 1111
log-adjacency-changes
area x.x.x.x. stub
network x.x.x.x. 0.0.3.255 area 0.0.0.0
!