06-21-2005 12:23 AM - edited 03-05-2019 11:34 AM
Hi All
I was looking at purchasing a 2811 router with additional Ethernet ports for routing between LANs. The only cards available for the 2800 series seems to be HWIC 'switch' cards. I understand that these cards also provide routing functionality thru. a Vlan interface, but can not see the point in purchasing this card if I already have ports available on an existing Cat switch and bit rate is not an issue. However, this still leaves me short of ethernet interfaces, so my question is: does routing between vlans on the subinterfaces of a trunk offer all the functionality (e.g. HSRP, NAT etc, etc), available from routing between separate L3 ethernet interfaces ? Can I configure the sub-interfaces with the full range of features available to L3 interfaces - (NB: accepting the that there is an aggregate bit rate for the trunk port).
Thanks in Advance
Solved! Go to Solution.
06-21-2005 05:05 AM
Hi Danny,
Not the full range of features are supported. Some are supported but with some limitations.
1) Like for HSRP
HSRP groups on subinterfaces must have a group number unique among all other groups on all subinterfaces on the same main interface. This is because subinterfaces do not receive a unique SNMP interface index. If you had two groups with the number N on different subinterfaces, then in the MIB, group N on sub-interface 1 and group N on sub-interface 2 would appear to be the same group.
Check this link
http://www.cisco.com/warp/public/619/hsrpguidetoc.html#subinterfaces
2) For QOS : CBWFQ : Not supported on subinterfaces
Check this link
3) Talking about NAT...yes you can apply NAT on subinterfaces
Check this link out
http://www.cisco.com/warp/public/556/nat-faq.html#Q8
HTH
Ankur
06-21-2005 05:05 AM
Hi Danny,
Not the full range of features are supported. Some are supported but with some limitations.
1) Like for HSRP
HSRP groups on subinterfaces must have a group number unique among all other groups on all subinterfaces on the same main interface. This is because subinterfaces do not receive a unique SNMP interface index. If you had two groups with the number N on different subinterfaces, then in the MIB, group N on sub-interface 1 and group N on sub-interface 2 would appear to be the same group.
Check this link
http://www.cisco.com/warp/public/619/hsrpguidetoc.html#subinterfaces
2) For QOS : CBWFQ : Not supported on subinterfaces
Check this link
3) Talking about NAT...yes you can apply NAT on subinterfaces
Check this link out
http://www.cisco.com/warp/public/556/nat-faq.html#Q8
HTH
Ankur
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