Can't get Ip address across trunk.

Anonymous · ‎04-11-2014

Hello

I set up a 3560 with two vlans 1 (data) 20 (voice) I allowed vlan20 across the trunk. However the only way my phone get an IP from DHCP is when they are dir. connected to the switch that is connected to our voice router.

As soon as I move the phones to the switch traversing the trunk I get nothing. I can ping both ways across the trunk (to the switches) I'm not sure what I'm doing wrong here. Anyone else have this issue?

switch at the far end of the trunk I can ping the switch dir. connected to the router/dhcp server, a phone connected to that switch, but not the router/dhcp server

From the switch directly connected to the router/dhcp server, I can ping the router/dhcp server

SIMPLE DIagram bold = switch

Router/DCHP server -> int fa0/11 voip-switch (trunk) fa0/7 -> fa0/24 tnetcsw1 -> phone fa0/1 & phone fa0/2

Anonymous · ‎04-11-2014

config's

here are the switch configs:

Switch at far end of the trunk.

3560 at far end of the switch
Current configuration : 6309 bytes
!
version 12.2
no service pad
service timestamps debug uptime
service timestamps log datetime msec localtime
service password-encryption
!
hostname TNETCSW1
!
no logging console
aaa new-model
aaa authentication login default local group radius enable
aaa authentication login TNB-Admin group radius local enable
aaa authentication login local-radius local group radius enable
aaa authorization exec default group radius local
!
username tnadmin privilege 15 secret 5 
ip subnet-zero
!
!
mls qos map cos-dscp 0 8 16 26 32 46 48 56
mls qos srr-queue input bandwidth 90 10
mls qos srr-queue input threshold 1 8 16
mls qos srr-queue input threshold 2 34 66
mls qos srr-queue input buffers 67 33
mls qos srr-queue input cos-map queue 1 threshold 2  1
mls qos srr-queue input cos-map queue 1 threshold 3  0
mls qos srr-queue input cos-map queue 2 threshold 1  2
mls qos srr-queue input cos-map queue 2 threshold 2  4 6 7
mls qos srr-queue input cos-map queue 2 threshold 3  3 5
mls qos srr-queue input dscp-map queue 1 threshold 2  9 10 11 12 13 14 15
mls qos srr-queue input dscp-map queue 1 threshold 3  0 1 2 3 4 5 6 7
mls qos srr-queue input dscp-map queue 1 threshold 3  32
mls qos srr-queue input dscp-map queue 2 threshold 1  16 17 18 19 20 21 22 23
mls qos srr-queue input dscp-map queue 2 threshold 2  33 34 35 36 37 38 39 48
mls qos srr-queue input dscp-map queue 2 threshold 2  49 50 51 52 53 54 55 56
mls qos srr-queue input dscp-map queue 2 threshold 2  57 58 59 60 61 62 63
mls qos srr-queue input dscp-map queue 2 threshold 3  24 25 26 27 28 29 30 31
mls qos srr-queue input dscp-map queue 2 threshold 3  40 41 42 43 44 45 46 47
mls qos srr-queue output cos-map queue 1 threshold 3  5
mls qos srr-queue output cos-map queue 2 threshold 3  3 6 7
mls qos srr-queue output cos-map queue 3 threshold 3  2 4
mls qos srr-queue output cos-map queue 4 threshold 2  1
mls qos srr-queue output cos-map queue 4 threshold 3  0
mls qos srr-queue output dscp-map queue 1 threshold 3  40 41 42 43 44 45 46 47
mls qos srr-queue output dscp-map queue 2 threshold 3  24 25 26 27 28 29 30 31
mls qos srr-queue output dscp-map queue 2 threshold 3  48 49 50 51 52 53 54 55
mls qos srr-queue output dscp-map queue 2 threshold 3  56 57 58 59 60 61 62 63
mls qos srr-queue output dscp-map queue 3 threshold 3  16 17 18 19 20 21 22 23
mls qos srr-queue output dscp-map queue 3 threshold 3  32 33 34 35 36 37 38 39
mls qos srr-queue output dscp-map queue 4 threshold 1  8
mls qos srr-queue output dscp-map queue 4 threshold 2  9 10 11 12 13 14 15
mls qos srr-queue output dscp-map queue 4 threshold 3  0 1 2 3 4 5 6 7
mls qos queue-set output 1 threshold 1 138 138 92 138
mls qos queue-set output 1 threshold 2 138 138 92 400
mls qos queue-set output 1 threshold 3 36 77 100 318
mls qos queue-set output 1 threshold 4 20 50 67 400
mls qos queue-set output 2 threshold 1 149 149 100 149
mls qos queue-set output 2 threshold 2 118 118 100 235
mls qos queue-set output 2 threshold 3 41 68 100 272
mls qos queue-set output 2 threshold 4 42 72 100 242
mls qos queue-set output 1 buffers 10 10 26 54
mls qos queue-set output 2 buffers 16 6 17 61
mls qos
spanning-tree mode pvst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
!
!
!
!
interface FastEthernet0/1
switchport mode access
switchport voice vlan 20
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape  10  0  0  0
mls qos trust cos
auto qos voip trust
spanning-tree portfast
!
interface FastEthernet0/2
switchport voice vlan 20
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape  10  0  0  0
mls qos trust cos
auto qos voip trust
spanning-tree portfast
!
interface FastEthernet0/3
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/4
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/5
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/6
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/7
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/8
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/9
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/10
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/11
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/12
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/13
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/14
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/15
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/16
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/17
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/18
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/19
switchport mode access
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/20
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/21
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/22
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/23
switchport voice vlan 100
spanning-tree portfast
!
interface FastEthernet0/24
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 20
switchport mode trunk
switchport voice vlan 20
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape  10  0  0  0
mls qos trust cos
auto qos voip trust
spanning-tree portfast
!
interface GigabitEthernet0/1
!
interface GigabitEthernet0/2
!
interface Vlan1
ip address 172.27.3.17 255.255.248.0
!
interface Vlan20
ip address 172.27.24.253 255.255.248.0
!
ip default-gateway 172.27.0.1
ip classless
ip http server
!
logging trap debugging
snmp-server community tnAdminDevicesComm RO
snmp-server enable traps tty
radius-server host 172.27.1.57 auth-port 1812 acct-port 1813 
radius-server vsa send authentication
!
control-plane
!
!
line con 0
line vty 0 4
login authentication local-radius
length 0
line vty 5 15
!
ntp clock-period 36029038
ntp server 172.27.0.230
end
 
TNETCSW1#sho vlan
VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Fa0/1, Fa0/2, Fa0/3, Fa0/4
                                                Fa0/5, Fa0/6, Fa0/7, Fa0/8
                                                Fa0/9, Fa0/10, Fa0/11, Fa0/12
                                                Fa0/13, Fa0/14, Fa0/15, Fa0/16
                                                Fa0/17, Fa0/18, Fa0/19, Fa0/20
                                                Fa0/21, Fa0/22, Fa0/23, Gi0/1
                                                Gi0/2
20   VLAN0020                         active    Fa0/1, Fa0/2
1002 fddi-default                     act/unsup
1003 token-ring-default               act/unsup
1004 fddinet-default                  act/unsup
1005 trnet-default                    act/unsup
VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1    enet  100001     1500  -      -      -        -    -        0      0
20   enet  100020     1500  -      -      -        -    -        0      0
1002 fddi  101002     1500  -      -      -        -    -        0      0
1003 tr    101003     1500  -      -      -        -    -        0      0
1004 fdnet 101004     1500  -      -      -        ieee -        0      0
VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1005 trnet 101005     1500  -      -      -        ibm  -        0      0
Remote SPAN VLANs
------------------------------------------------------------------------------

Primary Secondary Type              Ports
------- --------- ----------------- ------------------------------------------
TNETCSW1#sho int trunk
Port        Mode         Encapsulation  Status        Native vlan
Fa0/24      on           802.1q         trunking      1
Port      Vlans allowed on trunk
Fa0/24      20
Port        Vlans allowed and active in management domain
Fa0/24      20
Port        Vlans in spanning tree forwarding state and not pruned
Fa0/24      20

Anonymous · ‎04-11-2014

Switch dir connected to the router/DHCP server

ip subnet-zero
!
ip ssh time-out 120
ip ssh authentication-retries 3
mls qos map cos-dscp 0 8 16 26 32 46 48 56
mls qos min-reserve 5 170
mls qos min-reserve 6 85
mls qos min-reserve 7 51
mls qos min-reserve 8 34
mls qos
!
spanning-tree mode pvst
spanning-tree extend system-id
!
!
!
!
interface FastEthernet0/1
switchport mode access
switchport voice vlan 20
mls qos trust cos
auto qos voip trust
wrr-queue bandwidth 10 20 70 1
wrr-queue min-reserve 1 5
wrr-queue min-reserve 2 6
wrr-queue min-reserve 3 7
wrr-queue min-reserve 4 8
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out
spanning-tree portfast
!
interface FastEthernet0/2
switchport mode access
switchport voice vlan 20
mls qos trust cos
auto qos voip trust
wrr-queue bandwidth 10 20 70 1
wrr-queue min-reserve 1 5
wrr-queue min-reserve 2 6
wrr-queue min-reserve 3 7
wrr-queue min-reserve 4 8
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out
spanning-tree portfast
!
interface FastEthernet0/3
switchport mode access
switchport voice vlan 20
mls qos trust cos
auto qos voip trust
wrr-queue bandwidth 10 20 70 1
wrr-queue min-reserve 1 5
wrr-queue min-reserve 2 6
wrr-queue min-reserve 3 7
wrr-queue min-reserve 4 8
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out
spanning-tree portfast
!
interface FastEthernet0/4
switchport mode access
switchport voice vlan 20
mls qos trust cos
auto qos voip trust
wrr-queue bandwidth 10 20 70 1
wrr-queue min-reserve 1 5
wrr-queue min-reserve 2 6
wrr-queue min-reserve 3 7
wrr-queue min-reserve 4 8
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out
spanning-tree portfast
!
interface FastEthernet0/5
switchport mode access
switchport voice vlan 20
mls qos trust cos
auto qos voip trust
wrr-queue bandwidth 10 20 70 1
wrr-queue min-reserve 1 5
wrr-queue min-reserve 2 6
wrr-queue min-reserve 3 7
wrr-queue min-reserve 4 8
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out
spanning-tree portfast
!
interface FastEthernet0/6
switchport mode access
switchport voice vlan 20
mls qos trust cos
auto qos voip trust
wrr-queue bandwidth 10 20 70 1
wrr-queue min-reserve 1 5
wrr-queue min-reserve 2 6
wrr-queue min-reserve 3 7
wrr-queue min-reserve 4 8
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out
spanning-tree portfast
!
interface FastEthernet0/7
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 20
switchport mode trunk
mls qos trust cos
auto qos voip trust
wrr-queue bandwidth 10 20 70 1
wrr-queue min-reserve 1 5
wrr-queue min-reserve 2 6
wrr-queue min-reserve 3 7
wrr-queue min-reserve 4 8
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out
!
interface FastEthernet0/8
switchport mode access
switchport voice vlan 20
mls qos trust cos
auto qos voip trust
wrr-queue bandwidth 10 20 70 1
wrr-queue min-reserve 1 5
wrr-queue min-reserve 2 6
wrr-queue min-reserve 3 7
wrr-queue min-reserve 4 8
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out
spanning-tree portfast
!
interface FastEthernet0/9
switchport mode access
switchport voice vlan 20
mls qos trust cos
auto qos voip trust
wrr-queue bandwidth 10 20 70 1
wrr-queue min-reserve 1 5
wrr-queue min-reserve 2 6
wrr-queue min-reserve 3 7
wrr-queue min-reserve 4 8
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out
spanning-tree portfast
!
interface FastEthernet0/10
switchport mode access
switchport voice vlan 20
mls qos trust cos
auto qos voip trust
wrr-queue bandwidth 10 20 70 1
wrr-queue min-reserve 1 5
wrr-queue min-reserve 2 6
wrr-queue min-reserve 3 7
wrr-queue min-reserve 4 8
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out
spanning-tree portfast
!
interface FastEthernet0/11
switchport mode access
switchport voice vlan 20
mls qos trust cos
auto qos voip trust
wrr-queue bandwidth 10 20 70 1
wrr-queue min-reserve 1 5
wrr-queue min-reserve 2 6
wrr-queue min-reserve 3 7
wrr-queue min-reserve 4 8
wrr-queue cos-map 1 0 1
wrr-queue cos-map 2 2 4
wrr-queue cos-map 3 3 6 7
wrr-queue cos-map 4 5
priority-queue out
spanning-tree portfast
!
interface FastEthernet0/12
switchport trunk encapsulation dot1q
switchport trunk pruning vlan 20
switchport mode trunk
spanning-tree portfast
!
interface FastEthernet0/13
switchport mode dynamic desirable
!
interface FastEthernet0/14
switchport mode dynamic desirable
!
interface FastEthernet0/15
switchport mode dynamic desirable
!
interface FastEthernet0/16
switchport mode dynamic desirable
!
interface FastEthernet0/17
switchport mode dynamic desirable
!
interface FastEthernet0/18
switchport mode dynamic desirable
!
interface FastEthernet0/19
switchport mode dynamic desirable
!
interface FastEthernet0/20
switchport mode dynamic desirable
!
interface FastEthernet0/21
switchport mode dynamic desirable
!
interface FastEthernet0/22
switchport mode dynamic desirable
!
interface FastEthernet0/23
switchport mode dynamic desirable
!
interface FastEthernet0/24
switchport mode dynamic desirable
!
interface GigabitEthernet0/1
switchport mode dynamic desirable
!
interface GigabitEthernet0/2
switchport mode dynamic desirable
!
interface Vlan1
ip address 172.27.0.98 255.255.248.0
shutdown
!
interface Vlan20
ip address 172.27.24.252 255.255.248.0
!
ip default-gateway 172.27.0.1
ip classless
ip http server
!
 
voice-switch#sho vlan
 
VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Fa0/1, Fa0/2, Fa0/3, Fa0/4
                                                Fa0/5, Fa0/6, Fa0/8, Fa0/9
                                                Fa0/10, Fa0/11, Fa0/12, Fa0/13
                                                Fa0/14, Fa0/15, Fa0/16, Fa0/17
                                                Fa0/18, Fa0/19, Fa0/20, Fa0/21
                                                Fa0/22, Fa0/23, Fa0/24, Gi0/1
                                                Gi0/2
10   VLAN0010                         active
20   VLAN0020                         active    Fa0/1, Fa0/2, Fa0/3, Fa0/4
                                                Fa0/5, Fa0/6, Fa0/8, Fa0/9
                                                Fa0/10, Fa0/11
1002 fddi-default                     act/unsup
1003 token-ring-default               act/unsup
1004 fddinet-default                  act/unsup
1005 trnet-default                    act/unsup
 
VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1    enet  100001     1500  -      -      -        -    -        0      0
10   enet  100010     1500  -      -      -        -    -        0      0
 
VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
20   enet  100020     1500  -      -      -        -    -        0      0
1002 fddi  101002     1500  -      -      -        -    -        0      0
1003 tr    101003     1500  -      -      -        -    -        0      0
1004 fdnet 101004     1500  -      -      -        ieee -        0      0
1005 trnet 101005     1500  -      -      -        ibm  -        0      0
 
Remote SPAN VLANs
------------------------------------------------------------------------------
 
 
Primary Secondary Type              Ports
------- --------- ----------------- ------------------------------------------
 
voice-switch#sho int trunk
 
Port        Mode         Encapsulation  Status        Native vlan
Fa0/7       on           802.1q         trunking      1
 
Port      Vlans allowed on trunk
Fa0/7       20
 
Port        Vlans allowed and active in management domain
Fa0/7       20
 
Port        Vlans in spanning tree forwarding state and not pruned
Fa0/7       20

Anonymous · ‎04-11-2014

so I plugged in wireshark to monitor the trunk, and it looks like my pings to the gateway don't even hit the trunk. However I can still ping the other switch and phone connected to that switch. Why would my pings to the gateway not even hit the trunk?

Something else interesting I found. If I unplug the phone that is connected to the other switch and try to ping I don't see the request come across the trunk, that doesn't seem right. How can you troubleshoot if that's how it's supposed to work?

SteffenBaierUK · ‎04-14-2014

Hello dekelly1 ,

welcome to the Polycom Community.

You may want to try a community forum that supports or discusses the hardware by the manufacturer that you are using as this may provide more replies.

This community discusses anything manfucatured by Polycom.

Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.

Best Regards

Steffen Baier

Polycom Global Services

------------------------------------------------
Notice: I am an HP Poly employee but all replies within the community are done as a volunteer outside of my day role. This community forum is not an official HP Poly support resource, thus responses from HP Poly employees, partners, and customers alike are best-effort in attempts to share learned knowledge.
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