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Cisco Bug: CSCvu88225 - DHCP Option 125 getting corrupted after DHCP Relay Agent

Last Modified

Aug 06, 2020

Products (1)

  • Cisco Catalyst 9500H Series Switches

Known Affected Releases

16.12.3

Description (partial)

Symptom:
Option 125 of a DHCP Discover packets gets corrupted after DHCP Relay occurs on a C9500 running 16.12.3a.

Before DHCP relay agent:

    Option: (12) Host Name
    Option: (60) Vendor class identifier
    Option: (125) V-I Vendor-specific Information
        Enterprise: Vendor.ID
            Option 125 Suboption: 1
                Data: 506f6c79636f6d
            Option 125 Suboption: 2
                Data: 536f756e6453746174696f6e49502d535349505f3530303...

After DHCP relay agent:

    Option: (12) Host Name
    Option: (60) Vendor class identifier
    Option: (0) Padding
        Padding: 000000000000000000000000000000000000000000000000...
    Option: (167) Unassigned
        Length: 0
    Option: (0) Padding
        Padding: 00000000
    Option: (76) StreetTalk Directory Assistance Server
        Length: 157
[Malformed Packet: BOOTP/DHCP]

Conditions:
- Seen if VXLAN EVPN is configured for the Server side VLAN, with the following configuration:

vlan configuration #
 member evpn-instance 1 vni ###
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