Configuring Filters Without A Sequence Number; Configure Layer 2 And Layer 3 Acls - Dell S6100 Configuration Manual

Configuring Filters Without a Sequence Number

If you are creating an extended ACL with only one or two filters, you can let Dell Networking OS assign a sequence number based on the
order in which the filters are configured. Dell Networking OS assigns filters in multiples of five.
To configure a filter for an extended IP ACL without a specified sequence number, use any or all of the following commands:
• Configure a deny or permit filter to examine IP packets.
CONFIG-EXT-NACL mode
{deny | permit} {source mask | any | host ip-address} [count [byte]] [order] [monitor
[session-id]] [fragments]
• Configure a deny or permit filter to examine TCP packets.
CONFIG-EXT-NACL mode
{deny | permit} tcp {source mask] | any | host ip-address}} [count [byte]] [order] [monitor
[session-id]] [fragments]
• Configure a deny or permit filter to examine UDP packets.
CONFIG-EXT-NACL mode
{deny | permit} udp {source mask | any | host ip-address}} [count [byte]] [order] [monitor
[session-id]] [fragments]
When you use the log keyword, the CP logs details about the packets that match. Depending on how many packets match the log entry
and at what rate, the CP may become busy as it has to log these packets' details. The following example shows an extended IP ACL in
which the sequence numbers were assigned by the software. The filters were assigned sequence numbers based on the order in which
they were configured (for example, the first filter was given the lowest sequence number). The show config command in IP ACCESS
LIST mode displays the two filters with the sequence numbers 5 and 10.
Example of Viewing Filter Sequence for a Specified Extended ACL
Dell(config-ext-nacl)#deny tcp host 123.55.34.0 any
Dell(config-ext-nacl)#permit udp 154.44.123.34 0.0.255.255 host 34.6.0.0 monitor 111
Dell(config-ext-nacl)#show config
!
ip access-list extended nimule
seq 5 deny tcp host 123.55.34.0 any
seq 10 permit udp 154.44.0.0 0.0.255.255 host 34.6.0.0 monitor 111
Dell(config-ext-nacl)#
To view all configured IP ACLs and the number of packets processed through the ACL, use the show ip accounting access-list
command in EXEC Privilege mode, as shown in the first example in

Configure Layer 2 and Layer 3 ACLs

Both Layer 2 and Layer 3 ACLs may be configured on an interface in Layer 2 mode.
If both L2 and L3 ACLs are applied to an interface, the following rules apply:
• When Dell Networking OS routes the packets, only the L3 ACL governs them because they are not filtered against an L2 ACL.
• When Dell Networking OS switches the packets, first the L3 ACL filters them, then the L2 ACL filters them.
• When Dell Networking OS switches the packets, the egress L3 ACL filters the packet.
For the following features, if you enable counters on rules that have already been configured and a new rule is either inserted or prepended,
all the existing counters are reset:
• L2 ingress access list
• L3 egress access list
124 Access Control Lists (ACLs)
Configure a Standard IP ACL Filter.