VLAN's in Cisco 3750 doesnt work properly with HP4204vl

[utawakevou]

Hi,
I just recently install 2x Cisco 3750G series stacked and configured VLANs on it. My currently environment is totally using HP switches with VLAN’s and inter VLAN routing. We have 2 HP4204vl, one in server room A and the other located in server room B. The HP4204vl in server room B is doing the inter-VLAN routing. The 2 Cisco 3750G (stacked) is located on server room A and there is an uplink to the HP4204vl in server room A (port A24 on HP and port interface GigabitEthernet2/0/24 on Cisco)
When I plug in my connection to any port on the Cisco, I manage to acquire an IP address on VLAN 1 subnet from the DHCP server located on VLAN 2. However, when I change that port to belong to VLAN 2 (my server VLAN) I couldn’t acquire an IP address. I got some other VLAN’s configured on the Cisco box that will need to acquire network address from the DHCP server located in VLAN2.
Gradually we will then move the inter-vlan routing to the 3750. But for the time being we just want to hook in the stacked Cisco equipments and just do switching and VLAN’s. Some VLANS on he Cisco box doesn't need to propagate to the HP environment
I have worked with Cisco router doing inter-VLAN routing for VLAN’s on HP switches, but not HP doing inter-vlan routing for Cisco switches.
I must have missed something. Am attaching herewith my configuration on the HP4204vl and Cisco in server room A. If needed, I can post the HP4204vl in server room B i.e inter-vlan router

Hope someone helps

[utawakevou]

Any helpers out there ? Really need this up an running  

[manish arora]

Check out the IP HELPER-ADDRESS configuration part in the below mentioned link :-

http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_25_sec/configuration/guide/swdhcp82.html

Hope it helps

Manish

[utawakevou]

My L3 switch (HP4204vl) in server room B is handling that perfectly. I can connect any machine on any port on the HP4204vl in server room A and it can get its network configuration from the DHCP server. My cincern are the equipments connected to the Cisco box. It seems like VLAN tagging/trunk doesnt work properly

[Sebastian Helmer]

Hi, please post a "sh int trunk"  and sh cdp neigh detail  from the Cisco, I know HP supports cdp. I also think it is a trunk problem.

Did you configure VLAN 2 on the switch als VLAN and not only as an interface..I'm not sure if just a interface will work without a vlan config, but let me ask the stupid question . maybe post also a show vlan.

[Sebastian Helmer]

Uhhh after a review I see you forgott to set the tunk on the cisco.

I think that is the key

"switchport mode trunk"

On interace 2/0/24

you just set the encapsulation

[manish arora]

Mr. Helmer just scored a perfect 10 out 10 ...

[utawakevou]

Just add in the following to the interface:

interface GigabitEthernet2/0/24
description LINK TO HP4204vl
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate

CSR# show interfaces trunk

Port        Mode         Encapsulation  Status        Native vlan
Gi2/0/24    on           802.1q         trunking      1

Port        Vlans allowed on trunk
Gi2/0/24    1-4094

Port        Vlans allowed and active in management domain
Gi2/0/24    1-7,52-55,102,121-122

Port        Vlans in spanning tree forwarding state and not pruned
Gi2/0/24    1,3-7,52-55,121-122

CSR#show vlan

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Gi1/0/2, Gi1/0/3, Gi1/0/4, Gi1/0/5
                                                Gi1/0/6, Gi1/0/7, Gi1/0/8, Gi1/0/9
                                                Gi1/0/10, Gi1/0/11, Gi1/0/12, Gi1/0/13
                                                Gi1/0/14, Gi1/0/15, Gi1/0/16, Gi1/0/17
                                                Gi1/0/18, Gi1/0/19, Gi1/0/20, Gi1/0/21
                                                Gi1/0/22, Gi1/0/23, Gi1/0/24, Gi1/0/25
                                                Gi1/0/26, Gi1/0/27, Gi1/0/28, Gi2/0/1
                                                Gi2/0/2, Gi2/0/3, Gi2/0/4, Gi2/0/5
                                                Gi2/0/6, Gi2/0/7, Gi2/0/8, Gi2/0/9
                                                Gi2/0/10, Gi2/0/11, Gi2/0/12, Gi2/0/13
                                                Gi2/0/14, Gi2/0/15, Gi2/0/16, Gi2/0/17
                                                Gi2/0/18, Gi2/0/19, Gi2/0/20, Gi2/0/21
                                                Gi2/0/22, Gi2/0/23, Gi2/0/25, Gi2/0/26
                                                Gi2/0/27, Gi2/0/28
2    SERVER-VLAN                      active    Gi1/0/1
3    PRINTER-VLAN                     active
4    CLIENT-VLAN                      active
5    VoIP-VLAN                        active
6    LOTUVOIPVLAN                     active
7    SATLINK                          active
52   STAFF_WLS                        active
53   HOSTING                          active
54   STAFF_REMOTE                     active
55   GUEST_VLAN                       active
102  RB                               active
121  SOPAC_LINK                       active
122  SPBEA_LINK                       active
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
2    enet  100002     1500  -      -      -        -    -        0      0
3    enet  100003     1500  -      -      -        -    -        0      0
4    enet  100004     1500  -      -      -        -    -        0      0
5    enet  100005     1500  -      -      -        -    -        0      0
6    enet  100006     1500  -      -      -        -    -        0      0
7    enet  100007     1500  -      -      -        -    -        0      0
52   enet  100052     1500  -      -      -        -    -        0      0
53   enet  100053     1500  -      -      -        -    -        0      0
54   enet  100054     1500  -      -      -        -    -        0      0
55   enet  100055     1500  -      -      -        -    -        0      0
102  enet  100102     1500  -      -      -        -    -        0      0
121  enet  100121     1500  -      -      -        -    -        0      0
122  enet  100122     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

[utawakevou]

Sorry I did that configuration yesterday but it didnt solve the problem

[utawakevou]

I also add in vlan 28, 29,30,31 and notice that it doesnt show up on the show VLAN output

[manish arora]

attached lastest configuration as well as rough topology diagram and sh spanning tree detail from both devices.

Thanks

Manish

[Sebastian Helmer · Accepted solution]

I'm not happy with you vlan configuration.

please add for every interface vlan you configured in the cisco, a vlan to the vlan database.

Just:

conf t

# vlan x name abc

#

Or try to just use the necessary vlans on the trunk. I rember you can prevent vlans to on a port on hp? also you can disallow vlans on cisco trunk

switchport trunk vlan remove x,y,z

If it not helps post a show interface 2/0/24 switchport

also try to let dtp active and use not the switchport trunk noneogiate, just a try...

Thats all ideas for today, it's late here, see you tomorrow..

- Sebastian

[manish arora · Accepted solution]

not sure if this would help , but cisco switches are running PVST where as HP doesn't support it so I would say change the stp mode on cisco to rstp.

manish

[utawakevou]

I manage to sort out the issue

Reconfigure the switch and create "VLAN" instead of "Interface VLAN". Also I change the STP mode to MST as my HP's are using MST. Addition to that I configure cross-stack etherchannel for link redundancy and trunk at the HP side. WOrks okay now

Thanks for all your pointers