topic Re: ICX Brocade switch forwarding LLDP packet in ICX Switches

ICX Brocade switch forwarding LLDP packet

alex_shalima — Mon, 04 Dec 2017 17:08:19 GMT

Hello,

I'm working a hybrid-vendor network. Here is how it is all connected:

Cisco 4500 -> Brocade 7450 -> Brocade 7250 -> HP 2920

Situation:
The funny thing is that on the uplink port of the HP switch (port 24) I'm seeing the Cisco 4500 LLDP info. By standard, it shouldn't really be there. It's 2 hops too far to show that data.

------------------------------------------------------------------------------
Local Port : 24
ChassisType : mac-address
ChassisId : 78 a6 e1 09 cb 58
PortType : mac-address
PortId : 78 a6 e1 09 cb 8f
SysName : SW-MDF-3-02
System Descr :
PortDescr : 10GigabitEthernet1/2/7
Pvid : 7

System Capabilities Supported : bridge
System Capabilities Enabled : bridge

Remote Management Address
Type : ipv4
Address : 10.7.254.11

------------------------------------------------------------------------------
Local Port : 24
ChassisType : local
ChassisId : HRH-4500X-VSS
PortType : local
PortId : TenGigabitEthernet1/16
SysName :
System Descr : Cisco IOS Software, IOS-XE Software, Catalyst 4500 L3 Swi...
PortDescr :
Pvid :

System Capabilities Supported : bridge, router
System Capabilities Enabled : bridge, router

Remote Management Address
Type : ipv4
Address : 172.17.10.1

My question is: does Brocade implement any sort of LLDP packet forward mechanism? If it does, can it be limited to only 1 switch?

Re: ICX Brocade switch forwarding LLDP packet

BenBeck — Mon, 04 Dec 2017 20:13:00 GMT

If LLDP is off on the ICXs, we will likely forward/flood LLDP like any other packet. If LLDP is on (lldp run globally), we will trap it to the cpu and it will not be forwarded. Do you have LLDP on for the two ICXs?

Re: ICX Brocade switch forwarding LLDP packet

alex_shalima — Mon, 04 Dec 2017 22:19:43 GMT

Hi Ben,

Thanks for replying. I have checked both Brocades and LLDP was on. I also have ran "lldp run" command just in case.

"show lldp" from 7250:

SSH@MDF-3-02#show lldp
LLDP transmit interval : 30 seconds
LLDP transmit hold multiplier : 4 (transmit TTL: 120 seconds)
LLDP transmit delay : 2 seconds
LLDP SNMP notification interval : 5 seconds
LLDP reinitialize delay : 2 seconds
LLDP-MED fast start repeat count : 3

LLDP maximum neighbors : 392
LLDP maximum neighbors per port : 4

What is interesting is that 7250 switch does not show 2 entries like HP does, so it is working like intended, but the HP switches that connect to 7250 do show the Cisco 4500.

Re: ICX Brocade switch forwarding LLDP packet

mitchell_axtell — Thu, 07 Dec 2017 08:39:23 GMT

HP includes the output of "show cdp neighbors" in LLDP, and vice-versa. That looks like a CDP result, which the ICX switches are likely forwarding as they do not process it. You could try disabling CDP TX on the 4500's port to confirm.

Re: ICX Brocade switch forwarding LLDP packet

BenBeck — Thu, 07 Dec 2017 08:46:34 GMT

The same concept will apply for cdp as well. If it is off on the ICX, we forward it. If you turn on 'cdp run', we will evaluate incoming cdp and it will be shown in 'show fdp neigh' output.

Re: ICX Brocade switch forwarding LLDP packet

alex_shalima — Thu, 07 Dec 2017 16:42:18 GMT

Hi Mitchell and Ben.

Thanks for your replies.

Enabling CDP on both Brocade switches has solved it.

Cheers!

****SOLUTION****
Enable CDP on Brocade