Misc
LDP: 646 (TCP/UDP)
TDP: 711 (TCP/UDP)
BGP: 179 TCP
MSDP: 639
MSDP: RFC 3618
Private IP: RFC 1918
RSVP: IP Protocol 46
GRE: IP Protocol 47
OSPF: 224.0.0.5 (hello) & 224.0.0.6
RIPv2: 224.0.0.9
EIGRP: 224.0.0.10
Multicast: 224.0.0.0/4
Administrative Scope: 239.0.0.0 – 239.255.255.255
RFC1918: 10.0.0.0/8, 172.16.0.0/12, 192.168.00/16
ATM: MTU 4470
Dot1Q: 4 bytes overheads
PPPoE: MTU 1492
IPv4 = 32bit
IPv6 = 128bit
RD = 64bit
VPNv4 = RD+IPv4
MPLS Header = 32bit (20 bit label, 3 bit exp qos, 1 s bit, 8 bit ttl)
TLV: 6 bit (24 bit for metric-style wide)
eBGP: AD 20
EIGRP: AD 90 (internal) & 170 (external)
OSPF: AD 110
ISIS: AD 115
RIP: AD 120
iBGP: AD 200
ISIS Auth: interface (hello) & ISIS Process (LSP, CNSP, PSNP)
OSPF Auth: null, clear text, md5
ISIS: L2->L1 need redistribute, L1->L2 automatic
O : LSA 1 & 2
O IA: LSA 3:
O E1 & O E2: LSA 5
Multicast: LSA 6
NSSA: LSA 7
Opaque (for TE): LSA 10
Inbound: route-map, filter-list, prefix-list
outbound: prefix-list, filter-list, route-map
BGP Well-known Communities: no-export (local-as only), no-advertise (local only), internet, none
BGP communities: 32 bit (AA:BB – 16 bit each)
extended communities for MP-BGP: RT & SoO
aggregation: summary-only (suppress all specific routes), suppress-map (suppress some specific routes), attribute-map (set bgp parameter on summary), advertise-map (conditional)
AToM: ethernet, ATM AAL5, FR, ATM Cell Relay, PPP, HDLC, Circuit Emulation
Forwarding traffic to TE: static, PBR, autoroute
FRR Protection: Path & Node
tail and head have to be in the same area
PE-CE routing protocol: RIPv2, EIGRP, eBGP, OSPF, ISIS, static
OSPF redistribution:
- default E2
- E1: configure metric-type
- IA: check (or configure) domain-id
- O: sham-link
ORF: outbound route filtering (to save memory), need to be enabled both side
Inter-AS VPN:
option 1: back to back (no tagging in between ASBR)
option 2: MP-eBGP in between ASBR
option 3: eBGP in between ASBR, MP-eBGP in between RR
