BGP table
Address Prefix AS-Path Next hop Communities Other attr.
10.0.0.0 /8 65100 65101 1.1.1.1 65101:111
… … … … … …
IP routing table
Protocol Address Prefix Next-hop Outgoing interface BGP 10.0.0.0 /8 1.1.1.1
OSPF 1.1.1.1 /32 172.16.1.2 Ethernet 0
conn. 172.16.1.0 /24 Ethernet 0
IP routing table
Protocol Address Prefix Next-hop Outgoing
interface
BGP 10.0.0.0 /8 1.1.1.1
OSPF 1.1.1.1 /32 172.16.1.2 Ethernet 0
conn. 172.16.1.0 /24 Ethernet 0
To forward a packet to 10.0.0.0/8, the router perform the following steps:
Step 1. Search the ip routing table for a route to reach the 10.0.0.0/8 network.
Step 2. ___________________________
Step 3. Find the connected outgoing interface to reach 172.16.1.2. Step 4. Arp for the 172.16.1.2 MAC address if it is not already in the ARP cache. Step 5. Store the 172.16.1.2 MAC address in the Fast Switching cache for successive packets to network 10.0.0.0.
What is step 2?
A.
Search the BGP table for an IGP route to reach the BGP next-hop 1.1.1.1.
B.
Search the BGP table for an IBGP route to reach the BGP next-hop 1.1.1.1.
C.
Search the IP routing table for an IGBP route to reach the BGP next-hop 1.1.1.1.
D.
Search the IP routing table for an IGP route to reach the BGP next-hop of 1.1.1.1.
Explanation:
Routing table specifies to get to 10.0.0.0 goto 1.1.1.1. To get to 1.1.1.1 do a lookup in the routing table on the next hop.