Important Considerations; Standards, Protocols, And Related Reading; Requests For Comments (Rfcs) - 3Com corebuilder 3500 Implementation Manual

Important
Considerations
Standards,
Protocols, and
Related Reading
Requests For
Comments (RFCs)
Consider the following points when you use UDP Helper:
The maximum BOOTP hop count (how many steps the system uses to
forward a packet through the router) is 16; the default hop count limit
is . Keep the hop count as low as possible for performance purposes.
4
3Com recommends that you keep the UDP port number at 67. The
Port number 67, which is the industry standard, helps ensure that UDP
packets do not get dropped due to an unknown destination failure.
You can always add or remove a port number or IP forwarding address
defined for UDP Helper.
If possible, the system always bridges the UDP broadcast packet on
the same VLAN from which the packet was received. Therefore, if the
configuration has overlapped VLAN interfaces on a particular port,
and one of those interfaces is associated with the same VLAN as an IP
forwarding address, then the frame is broadcast to that VLAN,
regardless of the interface option that you have selected.
This section describes how to obtain more technical information about IP.
Documents called Requests for Comments (RFCs) contain information
about the entire set of protocols that make up IP. Some of the RFCs that
pertain to the discussions in this chapter are:
RFC 791 — Internet Protocol
RFC 951, 1542 — UDP Helper
RFC 1219 — Subnet Numbers
RFC 1878 — VLSMs
RFC 1256 — ICMP Router Discovery Messages
RFC 1058 — RIP
RFC 1723 — RIP Version 2
RFC 1786 — IP Routing Policies
RFC 2131 — DHCP
RFC 2400 — Internet Official Protocol Standards

Standards, Protocols, and Related Reading

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