DHCP config with MS loopback adapter

Here is the attached snapshot and config of my dhcp on 3725 router to get the desired result. Yes I m excited!


ip dhcp pool DATA
network 172.16.2.0 255.255.255.0
default-router 172.16.2.1
dns-server 4.2.2.2
!
!
!
interface FastEthernet0/0
ip address 172.16.2.1 255.255.255.0
duplex auto

Configuring Inter VLAN routing and DHCP-Scope-VLAN Bindings

Hats off to Taha for digging it to the level it demanded, this exercise has polished DHCP and inter vlan routing issues. the details of the config are as follows



Replace the 3550 with 3725 hooked with NM-16-ESW, yep im speaking the GNS-3 language, the IP addressing is different from the above image but topology remains the same, the configs are follows.


Layer3_Switch Config

!---ENABLING IP ROUTING

conft# ip routing

!---INTERFACE TO DHCP ROUTER

conft# interface fa1/1
conft# no switchport
conft# ip address 200.1.1.1 255.255.255.0
conft# no shutdown

!---CREATING DATA AND VOICE VLANS

conft# vlan 10
conft# name VOICE
conft# vlan 10
conft# name DATA

!---CREATING SVIs FOR DATA AND VOICE VLANS

conft# interface vlan 10
conft# ip address 172.16.1.1 255.255.255.0
ADDING AN IP HELPER ADDRESS TO DHCP SERVER TO GET AN IP THROUGH VOICE SCOPE
conft# ip helper-address 200.1.1.2

conft# no shutdown

conft# interface vlan 20
conft# ip address 172.16.2.1 255.255.255.0
ADDING AN IP HELPER ADDRESS TO DHCP SERVER TO GET AN IP THROUGH DATA SCOPE
conft# ip-helper address 200.1.1.2
conft# no shutdown

!---INTERFACE TO PC AND IP SOFT/PHONE

conft# interface fa1/10
conft# switchport access vlan 20
conft# switchport voice vlan 10
conft# no shutdown


!---CREATING A DEFAULT ROUTE

------------------------------------------------------------

DHCP Router Config

conft# interface fa0/0

conft# ip address 200.1.1.2 255.255.255.0
conft# no shutdown


(config)# ip dhcp excluded-address 172.16.1.1 172.16.1.9
(config)# ip dhcp excluded-address 172.16.2.1 172.16.2.9

(config)# ip dhcp pool DATA
(dhcp-config)# network 172.16.2.0 255.255.255.0
(dhcp-config)# default-router 172.16.2.1
(dhcp-config)# dns-server 4.2.2.2
(dhcp-config)# exit

(config)# ip dhcp pool VOICE
(dhcp-config)# network 172.16.1.0 255.255.255.0
(dhcp-config)# default-router 172.16.1.1
(dhcp-config)# option 150 ip 172.16.1.1
(dhcp-config)# exit

(config)# ip route 172.16.1.0 255.255.255.0 200.1.1.1
(config)# ip route 172.16.2.0 255.255.255.0 200.1.1.1


very helpful reference document,

http://www.cisco.com/en/US/tech/tk389/tk815/technologies_configuration_example09186a008019e74e.shtml

Voice Lab Setup 17-1-09

I have started setting up my home voice lab with initial infrastructure using 3725 routers at HQ, BR1 and BR2. I have added wic-2T and nm-16esw cards in each router. The initial step include the frame-relay setup among above 3 routers using frame relay switch. We can ping each HQ > BR1 and vice versa and also From HQ > BR2 and vice versa.

The config snap and topology snap is attached for your review.

Next steps would be adding HQ to local LAN, configuring vlans, dhcp server and ospf.

MCSE log

Classes of IP addresses,

Class A : 1-126 : 1.0.0.1 to 126.255.255.254
Class B : 128-191 : 128.1.0.1 to 191.255.255.254
Class C : 192-223 : 192.0.1.1 to 223.255.254.254
Class D : 224-239 : 224.0.0.0 to 239.255.255.255
Class E : 240-254 : 240.0.0.0 to 254.255.255.254

pecial address ranges

Some addresses are reserved for special uses (RFC 3330).^[2]

Address range	CIDR Equivalent	Purpose	RFC	Class	Total # of addresses
0.0.0.0 - 0.255.255.255	0.0.0.0/8	Zero Addresses	RFC 1700	A	16,777,216
10.0.0.0 - 10.255.255.255	10.0.0.0/8	Private IP addresses	RFC 1918	A	16,777,216
127.0.0.0 - 127.255.255.255	127.0.0.0/8	Localhost Loopback Address	RFC 1700	A	16,777,216
169.254.0.0 - 169.254.255.255	169.254.0.0/16	Zeroconf / APIPA	RFC 3330	B	65,536
172.16.0.0 - 172.31.255.255	172.16.0.0/12	Private IP addresses	RFC 1918	B	1,048,576
192.0.2.0 - 192.0.2.255	192.0.2.0/24	Documentation and Examples	RFC 3330	C	256
192.88.99.0 - 192.88.99.255	192.88.99.0/24	IPv6 to IPv4 relay Anycast	RFC 3068	C	256
192.168.0.0 - 192.168.255.255	192.168.0.0/16	Private IP addresses	RFC 1918	C	65,536
198.18.0.0 - 198.19.255.255	198.18.0.0/15	Network Device Benchmark	RFC 2544	C	131,072
224.0.0.0 - 239.255.255.255	224.0.0.0/4	Multicast	RFC 3171	D	268,435,456
240.0.0.0 - 255.255.255.255	240.0.0.0/4	Reserved[3],[4],[5]	RFC 1166	E	268,435,456

[edit] See also

Configuring IP Netflow in Cisco 3725

Configuring IP Netflow in Cisco 3725



Disclaimer: Credit to Josh (Head Geek) www.solarwinds.com