Quick Notes - Prefix-List Matching Class A,B,C

Prefix lists can be used to match a complete address class

Class A = 1.0.0.0 – 126.255.255.255
Class B = 128.0.0.0 – 191.255.255.255
Class C = 192.0.0.0 – 223.255.255.255


The classes can be defined by the starting bits in the first octet


Class A = 0
Class B = 10
Class C = 110


In order to match Class A, B, or C you need to perform the following:

Quick Notes - Administrative Distance

0     - Connected
1     - Static
5     - EIGRP Summary Route
20   - eBGP
90   - EIGRP
100 - IGRP
110 - OSPF
120 - RIP
160 - ODR
170 - EIGRP External Route
200 - iBGP
255 - Unknown

Cisco CRS-3 - Foundation for the Next-Gen Internet

Quick Notes - MPLS

Quick Notes - BGP Dampening with route-map

ip prefix-list XY seq 5 permit 10.0.0.0/15 le 32

route-map DAMPENING permit 10
 match ip address prefix-list XY
 set dampening 15 750 2000 60

router bgp 100
 bgp dampening route-map DAMPENING
 neighbor 192.168.0.2 remote-as 200

Cisco CRS-3

Quick Notes - IRB - IEEE

BBBB must be able to connect to AAAA and vice versa. Layer2 must be used on hub and AAAA/BBBB must leverage layer 3 ports on the directly connected interface.

Quick Notes - Multicast Boundry

In order to ensure AutoRP and the administratively scoped multicast addresses do not leak outside or into your multicast domain you need to filter the following:

224.0.1.40 - The Cisco multicast router AUTO-RP-DISCOVERY address is the destination address for messages from the RP mapping agent to discover candidates
224.0.1.39 - The Cisco multicast router AUTO-RP-ANNOUNCE address is used by RP mapping agents to listen for candidate announcements
239.0.0.0/8 - Administratively Scoped

Quick Notes - MPLS and OSPF

You must enable MPLS but you cannot enable "mpls ip" on the interface. Current network is leveraging OSPF.

R1

interface Serial1/0
 ip address 192.168.0.1 255.255.255.0
interface Serial1/1
 ip address 192.168.2.1 255.255.255.0

router ospf 1
 mpls ldp sync (this ensures that MPLS waits for the IGP to be fully synchronized before issuing labels - not required for the configuration)
 mpls ldp autoconfig area 0 (this enables MPLS on all interfaces that are in area 0)
 log-adjacency-changes
 network 0.0.0.0 255.255.255.255 area 0

R2

interface Serial1/0

 ip address 192.168.0.2 255.255.255.0

interface Serial1/1

 ip address 192.168.2.2 255.255.255.

router ospf 1
 mpls ldp sync
 mpls ldp autoconfig
 log-adjacency-changes
 network 0.0.0.0 255.255.255.255 area 0

Quick Notes - IPV6 DHCP Example

Server
ipv6 dhcp pool IPV6-2001
 prefix-delegation pool IPV6-2001
 dns-server 2001:2001::100

ipv6 dhcp pool IPV6-2002
 prefix-delegation pool IPV6-2002
 dns-server 2001:2001::100

ipv6 local pool IPV6-2001 2001:2001::/64 64
ipv6 local pool IPV6-2002 2002:2002::/64 64

interface Serial1/0
 ipv6 address 2001:2001::1/64
 ipv6 enable
 ipv6 dhcp server IPV6-2001
 serial restart-delay 0

interface Serial1/1
 ipv6 address 2002:2002::1/64
 ipv6 enable
 ipv6 dhcp server IPV6-2002
 serial restart-delay 0

Client
interface Serial1/0
 description CONN-IPV6-DHCP-PROVIDER
 ipv6 address FE80::2 link-local
 ipv6 address IPV6-2001 ::2/64
 ipv6 enable
 ipv6 dhcp client pd IPV6-2001
 serial restart-delay 0


interface Serial1/1
 description CONN-IPV6-CLIENTS
 ipv6 address FE80::2 link-local
 ipv6 dhcp client pd IPV6-2002
 ipv6 address IPV6-2002 ::2/64
 ipv6 enable
 serial restart-delay 0