26.1.4 Notes on using PTP

<Structure of this section>

(1) About coexistence with other functions

(a) Coexistence with Layer 2 Switch Function

See "Configuration Guide: Coexistence of Vol.1" "22.3 Layer 2 Switch Function and Other Functions".

(b) Coexistence with Layer 2 authentication

[5.2.1 See Coexistence of Layer 2 Authentication with Other Functions.

(c) Coexistence with other functions

The following tables list the additional features that are limited to coexist with PTP.

Table 26-6: Whether or not PTP can coexist with another feature
Functionality	Restrictions
Filters (Inbound)	Can only be partially used^#
DHCP Snooping	Cannot be used
VRRP
Uplink Redundancy
L2 Loop Detection
Policy-Based Mirroring
sFlow Statistics
IEEE 802.3ah/UDLD
CFM
LLDP
OADP
DHCP and BOOTP relay agents
DHCP server
RIP
OSPF
BGP4
IPv6 DHCP relay
IPv6 DHCP servers
RIPng
OSPFv3
BGP4+
BFD
VRFs

#: PTP messaging destined for the local switch cannot be discarded.

(2) Reception of PTP messaging other than UDP/IPv4

The Switch does not respond to unsupported IEEE802.3-MAC and PTP messages for UDP/IPv6.

(3) Reception of PTP Messaging with VLAN Tag

The Switch supports PTP messages without VLAN Tag and PTP messages with a single VLAN Tag. PTP messaging with two or more VLAN Tag is not supported.

(4) Notes on using IPv4 multicast

After setting PTP, connect PTP supporting device when using IPv4 multicast with the same port. If you connect a PTP supporting device prior to enabling PTP, it may temporarily prevent PTP messaging from being relayed when PTP is enabled.

(5) Notes on using the Layer 2 forwarding cutoff facility

The Layer 2 forwarding blocking functionality does not block PTP messaging.

(6) Notes on using IGMP snooping

PTP messaging is flooded regardless of IGMP snooping entries.

(7) Notes on using port mirroring

When a port on which PTP is enabled is mirrored as a monitor port, the forwarding delay included in the mirrored PTP message differs from the forwarding delay included in the mirrored PTP message.