H3C Technologies H3C S5820X Series Switches User Manual

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3-2

Functions

S5800 series

S5820X series

Mixed IRF of S5800 and S5820X

ARP entries: 16K

ARP entries: 8K

Numbers of ARP
and ND entries

ND entries: 8K
(multiplexing with
the ARP entries)

The maximum number of dynamic ARP
entries that an interface can learn is 16K and
the maximum number of neighbors that can
be dynamically learned on the interface is
8K. However, you need to make sure that
the number of the ARP/ND entries does not
exceed the maximum number of those on
the S5820X series; otherwise, the exceeded
entries cannot be created on the S5820X
series and will be created as blackhole
entries, which cannot be forwarded
normally.

Entries of IPv4
hardware forwarding
table: 16K

Entries of IPv4
hardware
forwarding table:
12K

Number of
hardware
forwarding table
entries

Entries of IPv6
hardware forwarding
table: 8K
(multiplexing with
the entries of IPv4
hardware forwarding
table)

Entries of IPv6
hardware
forwarding table:
6K (multiplexing
with the entries of
IPv4 hardware
forwarding table)

In a mixed IRF, the maximum number of
IPv4 hardware forwarding table entries is
designed as 16K and the maximum IPv6
entries is 8K (multiplexing with the IPv4
hardware forwarding table entries).
However, you need to make sure that the
numbers of the maintained IPv4 and IPv6
hardware forwarding table entries do not
exceed the maximum numbers of those on
the S5820X series; otherwise, some routes
will not be added into the hardware
forwarding table and cannot be forwarded
normally.

IPv4 Layer 2 or
Layer 3 multicast
groups: 4000

IPv4 Layer 2 or
Layer 3 multicast
groups: 2000

Number of
multicast entries

IPv6 Layer 2 or
Layer 3 multicast
groups: 4000
(multiplexing with
the ARP entries)

In a mixed IRF, the maximum number of
IPv4 multicast entries is designed as 4000.
However, you need to make sure that the
numbers of the IPv4 and IPv6 multicast
entries in the system do not exceed the
maximum numbers of those on the S5820X
series; otherwise, some multicast groups
cannot communicate normally.

Number of
MAC-based
VLANs

8K 4K

In a mixed IRF, if the number of MAC-based
VLANs exceeds the number of 4K (the
maximum number of MAC-based VLANs on
the S5820X series), the exceeded VLANs
cannot be applied successfully on the
S5820X series. Therefore, the exceeded
MAC addresses cannot be added into the
specified VLAN on the S5820X, and thus the
forwarding fails.

In a mixed IRF, you need to note the following items referring to ARP, ND, and multicast entries:

Suppose an IRF comprising S5800 series switches has already learned 16K ARP entries. If you

add an S5820X series into the IRF, a mixed IRF is formed. Then, the exceeded ARP entries (8K)

on the S5800 series will be converted to blackhole entries, and packets that need to be forwarded

based on the blackhole entries will be discarded directly.

Suppose a mixed IRF comprising several S5800 series switches and one S5820X series switch

has already learned 16K ARP entries (8K entries are maintained on the S5820X series, and 8K

normal entries and 8K blackhole entries are on the S5800 series switches). If the S5820X switch

leaves the IRF, the ARP entries on the S5800 series cannot be automatically cleared; therefore, 8K

blackhole entries are still on the S5800 series switches. The IRF can continue to learn ARP entries

until the number of entries reaches 16K only after you clear the ARP entries with the reset arp